I would suggest a good proportion of serious traders are active on these forums. When people regularly post 'we're going to the moon!' or 'zomg, here comes the crash' comments, they're more than likely talking their book. The largest traders probably have a good laugh when stories about The Manipulator surface.
I honestly think everyone talks their book to some extent. I also think your suggestion is plausible (or at least that they READ the forums), because I find it hard to believe that many traders who know about this forum would deem it useless.