You can even vote down minis with unregistered votes? That's rubbish. Generally, for contest like this, I vote only for myself (since I want to try to win) and for my mates (fairly, rounding up when in doubt): everything else I do not vote for, no matter if it is good or bad, unless something really makes my jaw drop and I feel that is MUST win, then I'll cast in a high vote.
As it is now, I am giving my friends straight tens, and I feel that I need to 'watch' everyone else just in case some pieces get undeserving high votes. That's really not the way it should be. Yeah, a contest set up this way could be won by networking, and that's cool. But to simply wreck the voting by sitting and refreshing your browser or changing your IP... that's cheating. I don't want to win (or even help others win) that bad.
6.3 with over 80 votes on a piece of that level, that's just stupid.