You don't say what the items are, - how do you know the person already won? Is there a reason why you feel a person should not want more than one of something?
Lots of people bid mostly with certain sellers. It is not unusual for people to have favourites. You suspect shill bidding, - maybe you're right. But being outbid is not grounds for accusing someone of shilling. Have you seen this link which explains how ebay's automatic bid system works:
http://pages.ebay.ca/help/buy/automatic-bidding.html
Getting outbid in ebay's proxy system is what causes newbies the most grief. It is clearly explained here:
http://pages.ebay.ca/help/buy/outbid.html
One person alone cannot drive the price up. Only two can do that. If you place a bid which has you in the lead, and later your are outbid, if you continue to play it that way, upping your own bid little bits at a time, it is you who is driving up the price.
I'm not saying shilling doesn't happen. Sure it does, - shilling is rampant on ebay. If, after you have read through the links I just posted, you are sure there is a shiller, then don't bid on it. The best way to protect yourself is to not bid in a dodgy auction.
Sure, there's a report button on every listing and you can report it for suspected shilling. But you'll also click your fingers to the nub before ebay does anything about it. They can't possibly know unless the shiller is daft enough to use another ID registered in her same name and address. And the higher the shill the more fees they make. Not to mention that "investigating" every time a newbie gets outbid would be extremely expensive. So protect yourself.
The best cure for a shiller is no bids at all. Rather than fuming about it, move on and find a more honest seller. Sometimes it is worth spending a little more money to deal with someone honest whom you can trust.
