So, when it comes to buying adspace on marginal sites with buy prices of about 500-2.5k, sites that aren't major media, and aren't done through ad brokers, what's to stop the site owner from seeing your CPA ads, assuming they're converting well (or else you wouldn't keep sending him money), saying you can't advertise on the site anymore, then running the own offer in the same adspaces you were? Seems like this could be a real possibility in this type of thing. I'm talking the gaming niche particularly. What do you media buyers do to deal with this possibility? Sure, the owner of the site won't know your ROI, but if he clones you offer, makes ads really similar to yours, he'll soon find out.