Very rarely -- and not in a few years, having grown up some -- I placed bids like the giant jump one at the end. Came out of frustration and anger at being constantly outbid outbid outbid on something I really wanted. Waited until the last minute and then put in a bid that was perilously close to Way Too Much For Me, figuring either I'd win, dammit, or, if the other guy sniped me, it might at least make him hurt. You want it, huh? Huh? This bad? Huh?
But I got over it.
It was just a phase I was going through.