C'mon guys. Clink vs. GPA was played out right here on the Boards. In the following thread, Ghost Town supplies a link to the original, which is now gone. However, pertinent sections from it are quoted:
In a nutshell, as was already mentioned, Clink only wanted to report certain sales as opposed to every sale, GPA did not want to only use only the big-ticket, high end sales.
I am glad GPA took that position, but if Clink doesn't want to report to GPA that's fine and their prerogative, the same as any other dealer or website.