I also saw a chosen few car the other day. Didn't think to look at what kinda car it was, I was to busy laughing.
Another big-ish one was illicit car club, which i never see anymore.
As far as I know, most of these clubs were involved in illegal activity of varying degrees, some being a front for some serious stuff, and that was their demise. The ring leaders probably got picked off by the cops and it all fizzled out. (an educated guess, but probably right based on the people i knew who took part)