Couldn't say, though I am experiencing something similar. Whenever I get into an RP board, I usually hang around in the background until I establish a group of like-minded weirdos and keep inviting the same four or five into whatever RP I'm running or just getting involved with. 

Eventually, the small group winds up being the major players in whatever RP individual members are running at the time. Haven't gotten there yet with Roleplayerguild, only been on a month. Hopeful, though. 

Times like this, I tend to blame the metric system. No particular reason, just flash back to Pulp Fiction. You know what they call D&D in Amsterdam? RP with cheese...