The bids arent anonymous. Theyre hidden. But I am skeptical of the "0" feedback guy bidding it up from $600. I had a guy bid up a car I was selling who had 0 feedback and I asked him if he was prepared to purchase the car since he bid it up over the reserve but had no previous feedback to back his bids. He stated "There is no way I'm going to buy this car. I will be kicked off of eBay before I pay you. Sorry". WTF!?
Hidden = "To help keep the eBay community safe, enhance bidder privacy, and protect our members from fraudulent emails, eBay has changed how User IDs display on the bid history page. Only you and the seller of the item can view your User ID, all other members will see anonymous user IDs, such as x***y."