I tend not to worry about the affiliate program scammers. They’re better at SEO than the pirate sites. These guys and the fake torrent sites that only serve malware make a it lot harder for people to find a working link for pirate downloads.
It's the standard affiliate program, anyone can use, even yourself. If you are directing customers from your own site (or Twitter/Flickr/Facebook ...) to the MyFonts sale, you get some extra percents.
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http://new.myfonts.com/affiliate/