The belief that a higher ARPU automatically translates into a stronger competitive advantage is a mirage. What matters is how much of that revenue survives the variable costs of serving each customer, not the headline number itself. When a firm raises prices across the board, it often nudges marginal users—those who are already on the edge of leaving—into the churn funnel, inflating the cost of acquisition and eroding the very economics that sustain the moat.

Consider a mid‑size SaaS outfit that recently launched a premium tier promising advanced analytics. The sales team shouted the new price point in every demo, and the finance dashboard glowed with a surge in ARPU. Yet the support team soon found themselves fielding a wave of tickets from customers who could not justify the extra spend, leading to a rise in support hours and a dip in renewal rates among the original base. The extra dollars vanished in higher churn‑related costs, leaving the company with a thinner margin and a moat that relied on a fragile, price‑sensitive segment.

The underlying mechanism is simple: price‑driven ARPU growth can mask a shift in the customer mix toward higher‑cost, lower‑margin accounts, turning a seemingly robust top line into a thin, volatile profit line. Once churn spikes, the loss of future cash flows outweighs any short‑term revenue boost, and competitors with steadier unit economics can undercut the inflated pricing and capture the disaffected users.

The lasting lesson is that sustainable moats are built on durable contribution margins, not on the arithmetic of headline revenue per user.