I downvoted someone the other day. I promised to do it worse if he wouldn't stop complaining. 6 or 7 messages over 4.5 cents. I originally intended to remove it if he responded in a normal fashion, but seconds after I gave the downvote he whined about it on one of my other posts before I could tell him why I did it. I almost paid for a bot to really punish him. He has been creating and upvoting very low quality stuff consistently for months, while saying he was busy and only doing it for days. He isn't the worst but he adds almost no value to the chain and messes with other people's bids because he cannot calculate how to do it. The most ironic part was his stupid bid cost him more than my down vote.