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I have many other affiliate programs that are not pulling their weight when I compare affiliate programs.
You answered your own question. You remove programs that do not pull their weight after an adequate testing period. I generaly give a program three months to start producing competitive revenues. This allows you to get some players on board and if retention is decent by the end of 90 days you should be earning enough revenue to justify keeping them on. If you arent then dump them, things arent likely to get better and you are wasting real estate on your sites. You are also wasting click throughs that could have been going to a program that would have converted.