Case #007: The form field that cost $4,000

Case #007: The form field that cost $4,000

An e-commerce offer, $52 average order, was converting on the lander but dying at the finish line. $4,300 spent, $3,100 back, a 28% loss. The ads worked. The lander worked. People reached the checkout and vanished.

We set up a funnel-step tracker to find the exact drop-off. The story was brutal in its specificity: 1,000 people added to cart, 640 reached the checkout, and only 110 completed. A 17% checkout completion rate was eating every cent of profit upstream.

We recorded session replays of the checkout. The killer was visible in seconds — a phone-number field marked required, with a validation that rejected anything without a country code, and no error message explaining why. People typed their number, got silently rejected, and left.

The fix took twenty minutes: made the phone field optional, added clear inline validation, cut the form from 9 fields to 5.

The checkout completion rate moved hard:

— from 17% to 41%
— cost per sale dropped from $70 to $29
— no change to traffic or spend, only the form

The rebuilt funnel over two weeks:

— $9,600 spent
— $17,800 revenue
— 85% ROI

A single badly-validated form field had been silently rejecting the customers I'd already paid to acquire.

The lesson: most checkout abandonment isn't hesitation, it's friction the user can't see and you didn't test — record the replays.