The whole thing about cliques (especially between roleplaying friends) is that people tend to stick with people that they know will provide them with an enjoyable roleplaying experience. Some people are straight up [i]afraid[/i] to join RPs by people they don't know out of paranoia that it'll go wrong, or they'll "waste their time" (Well, brudda, I'd honestly point that person to the definition of roleplaying). It's easier for them to form groups that they know will be reliable, and whatnot. I've formed many cliques because of these reasons (Though, I'm [i]heavily[/i] against pushing other people away).

While I'm not saying it's a good thing, I'm saying a natural and inherent occurrence that you'll see out in nature (Lone wolves starve, after all). That said, being a dick about it, and being an elitist, doesn't do anything but make you look... like a dickish elitist that needs to be knocked down a peg. 

And, yes, the subforum system is obsolete, and [i]honestly[/i] needs to be reworked since we have casual RPs that, by this site's standard, belong in the advance section, and vice-versa (Not gonna point out names unless you're one of those "casual RPs that belong in the advance section").