I've collected baseball items for over 30 years now but am pretty new to game used collecting. I've seen a number of items recently on a MLB auction site that seem to get consistently run up by a certain individual. This bidder ran me up on a jersey and then quit when he matched my bid. I know that these things happen but since that incident 8 weeks ago I've seen this individual do it other bidders and the suspicious part is that he has changed his bidder name 3 times in that 8 week time frame. How do you deal with individuals who you suspect are playing games while bidding???