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Daveit has also stopped me from bidding several times because I couldn't tell for sure whether the bidder that had just outbid me was a shill or not. Stopped bidding on some N172's yesterday when I couldn't tell for sure whther a particular bidder was a shill or not. Unfortunately, I didn't think to write down bidder names on the auctions I was bidding on and it made it difficult to trace.
I think the policy sucks, and it may just be a cheesey way for Ebay to gain more control over their website which has been proven to be insecure at times.