In that case, I would like to add an additional 5 mBTC to the prize pool (on behalf of MixTum).
However, if we come up with some more transparent and at the same time simple and fun way to vote, I would make sure that next year the prize pool would be several thousand dollars in bitcoins.
I know that you have best intentions, but if people keep adding more money to this contest, it will just create more drama and there will more complaints and more cheat attempts. Thats simply how it goes around here.
Imho, pizza badge should be reward enough and that way you would eliminate a lot of bad things from happening and still keep it somewhat fun and relax contest.