I've received a few emails about a document (PDF) describing the track records of Collective rights organizations (CROs), including from InfoJustice and one of the founders of Unglue.it (Another awesome alternative to CROs).
My own concerns about how CROs often push for exceptions to copyright in the form of compulsory licensing was included (See page 18, 19), with a reference to "Independent authors just wanting a little respect... from fellow creators and collective societies".