Originally Posted by After Shock Media

Paypals main adult customer base was small site owners who honestly never have been the type to do serious fraud in the first place, specially when it came down to fucking customers. Of that customer base a large ass chunk of them was the legal underage sites. They did not have the time to stick it out long enough in this business to gather a bunch of the larger sites. Not to mention almost no one was operating with multiple billers and such (no cascades). So the super programs with affiliate systems pretty much ignored paypal, unless it was an option for personal in house traffic. Again mostly because people could not credit the affiliate with an alternate sale and it would of been considered a leak.