In short, yes! If you are referring to putting the bidding up higher by say, having another account and using that account to bid high, then you are technically committing fraud. The problem would be in proving this to be the case. However, if you have any doubts and suspect this is happening then don't take the risk. If the seller is prepared to do this then what else are they doing wrong? I have a very simple rule on Ebay, if you have so much as the slightest doubt, do not bid - there will be another whatever come up in the future. Oh, and if it helps, this is quite often found to happen at "live" auctions (cars, antiques etc) but the rules are the same, prove it and you can prosecute.