Geez, i'd say there would be a couple of factors determining that. How much content they offer? how often it's updated? the methods you're using to advertise the site to get traffic/sign ups, etc etc etc... Don't laugh, but before I try out an affiliate program, I actually sign up as a member and check it out first. If it isn't something I would like, I simply cancel my membership and don't promote it.
Jack
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