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Bill- all that COULD mean is that he set a very high max bid and until another bidder out bids him that other bidder's call sign will not show up. So, it only appears that he is bidding against noone.
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Sam, that's not how I know eBay bidding to work

If 'drolds810' had made one bid of $200K, his bidder ID would show up only one time. As other people would bid lesser amounts, their bids would show up with their bidder ID.
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Bill, it looks like that bidder used one of the sniping programs to place his bids for him. You put in your top $ amount and it will consistantly increase your bid until it reaches your max $ or you are the high bidder. I still don't think those are real buyers though.