If you look at the top of the bidder\'s list window you\'ll see this message, which I\'ve copied and pasted:
eBay has changed how bid history information is displayed for higher-priced items. To help keep the eBay community safe, enhance bidder privacy, and protect our members from fraudulent emails, only you and the seller of the item can view your User ID in bid history. Other members will see anonymous names, such as x***y.