I think it's a matter of your board presence. You're articulate, you participate (you've got more posts than I do, and they tend to be substantive, or at the least contributive) and you post across a fair variety of boards and subjects. You post on old gods and current culture, I've seen you debate points without getting upset, and I've seen you call a notion dumb or fluffy without actually insulting the person who brought it up.
So, yeah. You may not have noticed yourself, but I did.
Wow, really? I guess I never noticed before. I think I should start paying more attention to my post from now on. Who knows, maybe in a few weeks I might take you up on becoming a thread starter.