The hidden force behind many “tier‑lock” experiments is not the number of price points but the way marginal customers re‑evaluate value across the ladder. When a mid‑tier is priced just low enough to tempt entry‑level buyers, those buyers feel they are upgrading, but premium‑seeking customers perceive the top tier as overpriced and downgrade, eroding the high‑margin segment. This creates a “value‑compression loop”: each new sign‑up pushes the average revenue per user down while the cost of servicing the extra users rises only modestly, so the net contribution margin falls.

A product team at a well‑known cloud storage provider introduced a new “plus” tier that sat between the free tier and the flagship “pro” tier. The plus tier’s price was set to attract power users who were flirting with the free limit. Within weeks, churn among pro customers spiked as they migrated down, and the average revenue per user slid noticeably, forcing the company to raise the pro price later, which then triggered a fresh wave of downgrades. The initial win‑back of free users turned into a margin drain because the mid‑tier acted as a “price bridge” that lowered the perceived distance between free and premium, flattening the pricing curve.

The lesson is that adding a tier is not a pure capture‑gain; it reshapes the perceived distance between all tiers, altering the elasticity of each segment. If the bridge is too low, the premium moat dissolves, and the firm ends up selling more units at a fraction of the margin it once commanded.