I never understood the BSP (Blatent Self Promotion) of stats like this. Member Counts. Here, there, or anywhere...
Personally, give be quality over quantity. And in the case of "Rep" forums where the content is borderline , I prefer low-profile...
I have accounts at all the usual suspects, but RWG is my homebase. In all honesty because it seems to have the lowest "Noise Level" (least amount of BSP, good level of constructive comments, easy to sweep in and Read New Messages in a reasonable amount of time.) Also, the forum software here rocks.
I will sale the For Sale section at RG does seem to have a bit more activity, so if buying and selling is your primary goal its a good place to go.
RG is more like Vegas
RWG is more like Monaco
Keep up the good work Admin,