Oh sure. Those are, to some extent, what I'm talking about (although I've never been to a burn). More specifically, the groups within them. Dragoncon, for instance, has tons of polys, but it also has tons of people. I'm just curious why certain specific groups seem so into it.
And as for circus arts, I've been doing sideshow work for years (blockhead, sword swallow, fire, mentalism). Definitely know that, and the weirdos that inhabit it.