There are still enough good affiliates and good publishers to go around.
In the mainstream world, the two biggest alternatives to standard affiliate marketing has been paid search engine placement, or programs dumping their affiliate programs to instead pay website owners Pay-Per-Click to run their banners.
I don't really see things like that happening with adult, for several reasons. One that comes to mind is that mainstream companies have a lot more leeway and ease to advertise their paid ads than adult companies. So that's one marketing area eliminated.
In general, Web 2.0 still hasn't figured out affiliate marketing.
Steve
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