The truth is, I haven't seen a single blog or affiliate site that's disclosing that they are paid a fee for each join they refer. And that's required under the new regulations as well.

My guess is that enforcement of this law is going to be extremely low on the priority list. It would probably be FTC that would do any enforcement action, and they generally only go after really egregious violations, like the totally fraudulent penis enlargement crap that was being sold on TV.