I agree, wipe out the worst of them first. Top 10 bidders a day get a 25% down vote until it's reasonable. Eventually, people will learn to avoid bidding their way on to first couple pages of trending 'all'.
People are still free to use bots and do whatever they want (this includes downvoting, too).
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Yep, i think that if incurring a loss, they will make different decisions, no matter how much they say "it is for promotion" :)