A $5‑up‑sell feels like free money because the extra feature appears marginal, but it also nudges a sizeable slice of price‑sensitive users into the churn zone. The mechanism is simple: each tier defines a price point that slices the demand curve; when the gap between tiers widens, the marginal cost of retaining a user jumps, and the elasticity of the “just‑above” segment spikes. Users who were comfortable at $15 now face $20 and must decide whether the added benefit justifies the extra spend; if the perceived incremental value is low, many silently defect to competitors or downgrade.

In a recent internal test at a mid‑size SaaS firm, the product team lifted the “Pro” tier from $30 to $35 while keeping “Enterprise” unchanged at $60. The churn rate among “Pro” accounts rose from 3.2 % to 6.8 % over the next quarter, erasing the $5 uplift and cutting total monthly recurring revenue (MRR) by 2 %. The hidden cost was not the higher price itself but the elasticity of the “just‑above” band, which the team had never measured.

The lesson is that tier spacing creates a “price elasticity trap”: the farther apart you push the next rung, the more you invite a wave of marginal users to jump off. The trap is amplified when the added features are not uniquely valuable, because the perceived utility curve stays flat while the price curve steepens.

Finally, the trap is not immutable. By calibrating tier gaps to the actual willingness‑to‑pay distribution—using small‑scale price experiments—you can capture upside without triggering a churn cascade.