I think as others have said, the 80/20 rule applies, but I wouldn't say that the ones who aren't sending traffic are useless.
Most webmasters diversify, so there's a bit of a revolving door. Someone who isn't sending traffic now may send traffic 2, 3 months down the road, maybe even over a year after joining.
So yeah, while some registered affiliates may never promote your program, most are valuable leads. Just my
