They volunteer to vote just fine. Could a moderation system be built on that?

I mean, you vote. And the people you vote also vote. And those you vote highly can maybe be trusted to vote accurately and so on. A lot could be done with that voting data.

And maybe you could even get them to vote twice or something.

What we're shooting for is totally user driven (because moderation can't be trusted) and low effort (because users are lazy)