The CAC problem no one is talking about
Rising CAC is not a media efficiency problem. It's a relationship architecture problem. The brands that solved it long-term did it by compounding the relationship.
01 · DIAGNOSTIC OBSERVATION
The data on rising customer acquisition costs is not in dispute. What is in dispute (or more precisely, what is rarely examined with sufficient precision) is the cause. Digital advertising costs more per impression than it did five years ago. Organic reach on social platforms has compressed. Competition for attention is higher than it has ever been.
The conversation almost always goes the same way. The problem is attributed to platform costs, algorithm changes, increased competition, or macroeconomic pressure. The solution proposed is almost always some version of better targeting, smarter bidding, or a new channel mix. The CAC problem is treated as a media efficiency problem.
In seven years of applying the Four Pillars of Customer Acquisition™ framework across brands in multiple categories, I have not once encountered a CAC problem that was primarily a media efficiency problem. Every CAC problem I have diagnosed has been, at its root, a relationship architecture problem.
The distinction matters because the solutions are completely different. A media efficiency problem is solved by better allocation of the same budget. A relationship architecture problem is solved by building the structural conditions that reduce the need for paid acquisition in the first place: community infrastructure that generates word-of-mouth, educational authority that produces inbound consideration, and advocacy architecture that converts satisfied customers into an acquisition channel. Brands that have genuinely solved CAC have almost always done it by building one or more of these mechanisms, not by finding a cheaper path to the same customer.
“If your finance team cut your community investment tomorrow, would your CAC increase within 90 days? Most brand leaders cannot answer that question with confidence. That is the gap.”
The question is not rhetorical. It is diagnostic. A brand whose CAC would increase immediately if community investment were cut has built its acquisition engine on a structural foundation. A brand that cannot answer the question has not. The Four Pillars framework exists to make that distinction measurable rather than intuitive.
02 · CASE STUDY
Glossier · What happens when you dismantle the acquisition engine
Last month I published a detailed analysis of the Glossier case on LinkedIn. The complete case analysis is worth reading for the full diagnostic picture. But the CAC argument at its center is worth restating here because it is one of the clearest examples I have encountered of what happens when a brand dismantles its relationship architecture and discovers, too late, what it was actually paying for.
Into The Gloss, Glossier’s founding editorial platform, was generating 1.5 million monthly readers before Glossier sold a single product. That community was the acquisition engine. Customers arrived already educated, already invested, already advocates. The Rep program converted the most engaged community members into a structured referral channel. The result was a brand that grew to a $1.8 billion valuation while spending almost nothing on paid acquisition. The relationship architecture was the acquisition mechanism.
In 2020, Glossier eliminated its entire in-house content team. Into The Gloss was ended in a single cost-reduction decision. The financial logic was straightforward: the content team was expensive and its contribution to revenue was not directly measurable on a quarterly P&L. The accounting treatment was overhead. The diagnostic reality was something else entirely: it was the primary educational and community infrastructure the brand had ever built. Eliminating it did not reduce overhead. It dismantled the acquisition engine.
Four Pillars Diagnostic — Glossier · Composite Score: 58/100 · Developing
The financial evidence followed with a lag, as it always does when the relationship structure is dismantled. By 2021, Glossier reported an operating loss of approximately $84 million. The valuation declined an estimated 80% between 2019 and 2022. A third of the corporate workforce was laid off. Beginning in 2023, the brand moved progressively into wholesale partnerships with Sephora, SpaceNK, and Mecca, a structural pivot driven by the need to stabilize cash flow and reduce customer acquisition costs. The brand that had built a near-zero CAC acquisition engine was now paying distribution margin to access customers it could no longer reach on its own.
This is what a relationship architecture problem looks like when it reaches the income statement. The CAC did not rise because the media landscape changed. It rose because the structural conditions that had suppressed it — specifically community architecture, educational authority, and advocacy infrastructure — were systematically eliminated. And the cost of rebuilding those conditions, once dismantled, is significantly higher than the cost of maintaining them would have been. In March 2026, Glossier’s new CEO announced the closure of nine of its twelve stores as part of a recovery attempt explicitly aimed at returning the brand to its original relationship architecture. The restructuring is ongoing. The outcome is genuinely uncertain.
03 · DIAGNOSTIC QUESTION
“In your brand’s budget, which line items are relationship architecture, and which ones are labeled overhead?”
The Glossier case makes the stakes concrete. Community investment, educational content, ambassador programs, and post-purchase engagement infrastructure rarely show up correctly in accounting terms. They produce diffuse returns over long time horizons. Their contribution to acquisition, retention, and advocacy is real but indirect. When financial pressure arrives, they appear on the cost-reduction list, because no one has mapped them to the CAC they suppress. The diagnostic question worth sitting with this month is not how to acquire more customers. It is whether your finance team knows the difference between your overhead and your acquisition engine. Across the brands the diagnostic has been applied to retrospectively, they are almost never the same thing. And the confusion is expensive.
This newsletter publishes on the first Tuesday of every month. Each issue covers one diagnostic observation, one brand case study, and one question worth asking about your own relationship architecture. Next month’s issue examines Starbucks — specifically, what the brand lost when it stopped being a third place, and what that structural decision reveals about community architecture.
Randolf Saint-Leger Founder, Cognitree Group · cognitreegroup.com