Reap Marketing optimized its own e-commerce conversions by 950% through conversion rate optimization testing. The document discusses several AB tests Reap conducted for clients, including changing call-to-action button text, which increased homepage clicks by 359%, and replacing "Free" with "Complimentary" in offers, which increased revenue despite a small decrease in conversion rate. The document emphasizes how testing hypotheses through AB tests can provide substantial lifts in key metrics like conversion rates and revenue.