I'm interested to hear how you got on as well. In my experience though USFreeAds doesn't convert that well - although if you can get some ads on Google page 1 you might do ok. Article marketing has always been a better source of income for me.
My guess is one of two things happened: 1. Testing was so successful he's busy right this second creating more ads and furthering his research or 2. Testing returned results that weren't worth posting I hope it was #1!