The conversion rate that went up while money went down

The conversion rate that went up while money went down

An ecommerce store ran a popup that pushed conversion rate from 2.1% to 2.9%. The team called it a win and rolled it everywhere. Two months later, monthly revenue was down 8%.

The gap hid in average order value. The popup offered a 15% coupon to anyone hesitating, so more carts closed — at thinner margins and smaller baskets. AOV had slipped from $84 to $61.

Conversion rate, the metric they optimized, was the wrong north star. We switched to revenue per session.

Killing the blanket coupon and showing it only on exit intent restored AOV to $79 while keeping conversion at 2.6%. Revenue per session rose from $1.77 to $2.05.

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Lesson: a rising conversion rate can quietly cannibalize revenue. Optimize for revenue per visitor, not the percentage that feels good in a report.