I have not enroll him and never will be
This is why I think Blazed's idea of a public shamelist would be great. Signature managers could check the list whenever someone applied, and if they were on it for insubstantial posts, then they could refuse them. Easy.
Good campaign managers will already check the quality of posts of new applicants whereas shitcampaigns like yobit and secondstrade aren't going to bother checking any lists and will just continue to accept and happily pay any turds that sign up.