Strategic Analysis · FY2019 – FY2024
Costco has built one of the most loyal customer bases in retail history. Yet 76 million paying members largely don't know — or don't use — its digital storefront. That gap is the opportunity.
Act I
Costco isn't just a warehouse club. It's a membership flywheel — where loyalty funds low prices, and low prices fund more loyalty.
Costco operates on a model most retailers would consider suicidal: merchandise is sold near cost. The actual profit engine is the membership fee.
In FY2019, membership fees were $3.35B — just 2.2% of total revenue. But they covered roughly 72% of operating income. By FY2024, fees grew to $4.83B, with 76 million paid members and a 90.5% worldwide renewal rate.
The implication is striking: Costco doesn't need to maximize margin on every sale. It needs to maximize member satisfaction. That creates a structural opening for digital expansion that most retailers don't have.
Costco's total revenue nearly doubled in seven years — but membership fee revenue, the real profit engine, grew even faster in relative terms. The question is: is there an untapped digital multiplier hiding in this loyal base?
Act II
Costco has built the most loyal membership base in retail — and then left it largely untouched by digital strategy. That's both a problem and an enormous opportunity.
Costco spends virtually nothing on digital marketing compared to Walmart or Sam's Club. Its social media presence is minimal. Most members associate Costco with the warehouse experience — not an e-commerce platform.
Walmart CEO called Sam's Club the company's "innovation engine." Sam's has built scan-and-go checkout, curbside pickup at scale, and a digital-first membership model. Costco risks ceding the digital member to a well-funded rival.
Costco's economics are built around driving foot traffic — a member who shops online instead of in-store buys fewer impulse items, skips food courts, and requires costly fulfillment. But resisting digital means leaving the next generation of shoppers behind.
E-commerce comparable sales grew 16% in FY2024 and 20.7% in Q3 alone. Costco Logistics delivered 4.5M items — up 29%. The product is improving. The bottleneck is awareness and digital marketing investment, not the platform itself.
In every year except FY2023 (post-pandemic correction), Costco's digital channel grew faster than its physical stores. Yet it still represents only ~7% of total revenue — a clear sign of underinvestment in channeling members online.
Act III — The Evidence
A data-driven look at where Costco's digital gap is largest — and what it's costing them.
By comparison, Walmart's e-commerce share has grown to nearly 18% of total US sales. Amazon is functionally an e-commerce-only retailer. Even BJ's Wholesale, with a fraction of Costco's resources, outpaces Costco in online grocery market share.
Online revenue tripled from $6B to $17.5B — but still represents a small slice of the member base's full spending potential.
| Company | E-comm % of Sales | Digital Strategy | Positioning |
|---|---|---|---|
| Amazon | ~70% | Pure-play digital; logistics moat | Leader |
| Walmart | ~18% | Omnichannel; pickup & delivery at scale | Advancing |
| Target | ~18% | Same-day drive-up; strong app | Advancing |
| Sam's Club | ~15% | Scan-and-go; curbside; digital-first membership | Growing fast |
| Costco | ~7% | Organic growth; limited digital marketing | Underweight |
| BJ's Wholesale | ~5% | BOPIS investment; smaller scale | Catching up |
Sources: company filings, Digital Commerce 360, Nasdaq. E-comm % estimates for FY2024.
Thin margins (3–3.5%) have remained stable. Digital sales typically carry higher margins — expanding online could improve this over time.
Membership grew from 53.9M to 76M paid members, with renewal rates consistently above 88%. This installed base is Costco's greatest digital asset — and its most underutilized one.
Act III continued — Analysis
Using established frameworks to understand the forces shaping Costco's digital opportunity — and the risks of inaction.
Five forces shape the competitive logic of warehouse retail — and each one is shifting in ways that make Costco's digital gap more urgent.
Building a membership warehouse network at Costco's scale requires billions in capital and decades of brand trust. New entrants can't replicate this. However, digital-native entrants (Amazon, Temu) can target Costco members online without warehouses — raising the urgency of a stronger digital presence.
Members have historically low price sensitivity due to the value proposition, but younger members (Millennials, Gen Z) have higher digital expectations and are more willing to comparison shop online. Costco risks losing this cohort to platforms with better UX.
Costco's scale gives it extraordinary leverage over suppliers. This extends to e-commerce: exclusive online deals and digital-only SKUs are a realistic strategy that suppliers would welcome given Costco's traffic volume. A stronger digital platform amplifies this advantage.
Amazon Prime is the closest substitute to Costco's membership model — and it's digital-first. The risk isn't that Costco loses existing warehouse shoppers. It's that the next generation of "members" chooses Prime over Costco because they never develop the in-store habit.
Sam's Club is the most direct digital threat. Backed by Walmart's technology investment and logistics network, it has made scan-and-go, curbside, and digital membership its core strategy. Walmart CEO has called it the company's "innovation engine." Costco's relative inaction is a strategic risk.
90%+ renewal rates = a captive audience for digital activation. Kirkland Signature brand commands loyalty beyond competitors. Thin-margin philosophy means digital expansion doesn't require repricing. $4.83B membership revenue base funds investment. Instacart partnership already provides infrastructure for same-day delivery.
Digital marketing budget is minimal compared to peers. Website UX historically lagged — online prices sometimes higher than in-store. Limited BOPIS (buy online, pick up in store) capability vs Sam's Club. Brand awareness for online channel is almost zero among existing members.
76M paid members who are already loyal — the lowest-CAC audience in retail. E-commerce growing 16–20% YoY with limited marketing support. International expansion creates new digital-native member cohorts. Executive members (74%+ of sales) are high-income and digital-capable. Costco Logistics scaling 29% YoY.
Sam's Club investing aggressively in digital. Amazon Prime offers an alternative "membership" model. Younger shoppers default to digital-first retailers. Online members renew at slightly lower rates than warehouse sign-ups — a structural warning signal to watch. Tariff and macro headwinds affecting discretionary categories.
Assessing Costco's internal resources through a VRIO lens — what can they leverage for digital expansion that competitors can't easily copy?
Costco's closed membership system means 100% of purchases are tied to an identity. This first-party data is Valuable, Rare, and hard to Imitate. In an era of cookie deprecation, this is a marketing asset worth billions — if leveraged for digital targeting.
The Kirkland brand is a moat that no competitor has replicated. It drives higher margins online than branded products and serves as a reason to shop Costco digitally rather than substituting with Amazon. This is the centerpiece of any digital marketing campaign.
Costco Logistics (4.5M deliveries in FY2024, up 29%) is scaling. The Instacart partnership handles grocery last-mile. But both are nascent vs Walmart's 4,600-store fulfillment network. The advantage is real but fragile without continued investment.
Costco's digital marketing spend and sophistication are meaningfully below peers. No significant social media ad presence. Costco's own data shows Meta drives 93.4% of social checkout traffic — but they're not maximizing this channel. This is the clearest capability gap to address.
The macro environment shapes both the urgency and the feasibility of Costco's digital move. Key forces are aligned in Costco's favor — but the window may not stay open.
Cookie deprecation and ad privacy changes make first-party member data more valuable, not less. Costco's closed membership system is structurally positioned for the privacy-first advertising era — but only if they build the digital marketing infrastructure to use it.
Inflation and value-seeking behavior pushed younger demographics toward Costco for the first time in FY2022–2023. Many shopped in-store but never discovered the online channel. A targeted digital campaign to this cohort, while their loyalty is still forming, is high-ROI.
Millennials and Gen Z shop digitally first and physically second. They are becoming the core membership demographic. Costco's in-store-first model risks being perceived as "for parents" rather than a lifestyle brand — unless digital marketing actively reshapes that perception.
Sam's Club is the existential digital threat. Walmart's investment in its innovation arm is substantial and sustained. If Costco waits another 3–5 years to invest in digital awareness, Sam's may have established enough digital loyalty among younger members that the window for Costco closes permanently in that cohort.
Act IV — The Recommendation
Costco should not try to become Amazon. It should launch a targeted digital awareness campaign to its existing 76 million members — turning passive card-holders into active online shoppers without compromising the in-store experience.
Make members aware that Costco.com exists and offers Kirkland Signature, bulk staples, and big-ticket items at warehouse prices.
Newly activated online members renew at lower rates than warehouse members — close that gap before it becomes structural.
Turn the membership data flywheel into a digital marketing engine that rivals Amazon's recommendation engine — without the privacy tradeoff.
Costco already has everything it needs to win online: 76 million loyal members, the most trusted private label in retail, and an e-commerce platform that — when members find it — delivers strong growth. The missing ingredient isn't technology or product. It's telling people it exists. That is a marketing problem, and it's the most solvable kind.
Sources & Citations