Rule number 1 of the Internet: Everyone who disagrees with me is dumb and/or a troll.
Rule number 2 of the Internet: I am always right.

But going back to the original topic: At first I thought that a lottery was a good idea, but then others mentioned bots and the suggestion came crashing down. UNLESS, maybe, you made the entry to that lottery time limited as well so not everyone and their mother's bots get to enter.
I am not sure how useful that would be, but I'd like to hear your suggestions.