A site like that would get shut down so fast it'd be dumb, no webmaster out there would allow their content to be used in a way that can disrupt his/her ability to make money.
A thread like that would be a pain in the ass for the forum staff because it'd open drama up like crazy. Webmasters getting pissy with us etc. Meh, sort of like what Rach said.. watch how often the girl is involved with her site etc. I don't completely agree with the see how often a girl tweets or posts because that can easily be her webmaster just as easy. Cam shows are often the only way you know the girl is actually the girl and not bought content. Then again, how does one know she's not just paid for her cam show? haha Gotta just find a girl you like and give her site a try and see if it works for you.
In regards to posting in the forums, some guys need to realize that just because a girl doesn't add her two cents to some thread they find uninteresting for whatever reason, doesn't mean she's not here. 16 models have been here in the last 24 hours according to login stats.
I hear what you're saying regarding who's active, but it's easier just to find a girl you like and follow her rather than trying to be an industry watchdog. if you find the girl you like isn't active to the degree you'd like, find one that is.

There's lots of great girls out there, why not focus on the positive?