This has been a useful thread, and the feedback is great.
I think this is a case where you have to choose carefully which networks you partner with. Both networks and the merchants that they work with have a shared responsibility to screen affiliates carefully, but basically the task comes down to the individual who is managing each specific affiliate program (in my opinion). Occasionally inexperienced merchants join a network and set up an affiliate program expecting the process to be quick and easy without realizing (or wanting to do) all the important administrative work that goes along with it. Like Mushroom said - it's a matter of not dedicating the necessary resources.
That being said, not all networks operate on this model, and I think those that implement the proper anti-fraud procedures will continue to grow sucessfully.
