Why do people climb mountains? Because they are there, is the famous rejoinder. But it's more than that, of course. I've gone around plenty of mountains in my day. It's things that capture your imagination that get you working feverishly, sometimes seriously, sometimes just for fun. Just being in the way doesn't always do it.
The best stuff is always when people make serious fun out of the serious stuff. Or you can go the other way, and watch people spend two forty-hour weeks making costumes for Star Trek conventions.
All that said, I have no idea what to file this bad boy under: