they sell various stuff ranging from adsense ebooks to diet ebooks, marketing tools and other stuff here is the link http://dtmurl.com/m8
I think it's hard to get people to buy things from those merchants because they usually go for the cheapest like buying from ebay
but it is easier to get new affiliates to sign up and enter bank account info... easing the process of charging the $50 setup fee if i owned that site i would focus on tv or magazine ads I like this rule though