I just want to share my experience with one of my clickbank affiliate websites. I have a website on top3 for a medium competetivity keyword, i was getting a lot of traffic from Big G and good number of hops but the conversions were too low although I was promoting the top product of my niche. One day (24 Dec 11 ) i decided to keep my main product review but only change the promoted product. so here's the stats Before and after, i will show you the part where all changed. Before After The new product i am promoting now have a gravity=10 (low gravity doesn't mean shit product!) and i've already made more then 1k from that only website since i switched product. I encourage myself and my BHW friends to always test test and test. That was only one aspect of split testing and many other factors can highly influence the conversions. Have a good day.