Called shilling the auction, same effect as when, in a physical auction, there is a fellow in the crowd who works for the house who sticks his hand up every once in the while acting like a bidder to drive up the prices. Typical sign on ebay are auctions that have 2 bidders, and that get relisted instead of sold, because the seller screwed up and was stuck with his own high bid....
Unfortunatly, when ebay changed the bidders listing to hide the identity of bidders, they aggrivated this problem by hiding the seller as bidder also...
ebay customer service , can, however, see who bids......