I think deep down the ASCAP just cannot stomach why anyone would release their work for free.
Copyleft businessmen do have a strong incentive in having corporations implementing ways to make pirating copyright materials more expensive/risky, but not use it themselves.
In a way, the RIAA, ASCAP, and other copyright organization are unwitting accomplice in the rise of copyleft and copyfree entrepreneurs, however fews exist.
About that word "free" that you keep bandying about... I don't think it means what you think it means.
People naturally want to share things which they find entertaining with their friends, and I see this as a psychological trait which is hard to suppress and isn't going away any time soon because it's a fundamental aspect of human culture. In a theoretical world of perfect copyright policing the only way to stay fully engaged in cultural exchange will be via media with CC type permissions.