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DDhttp://story.news.yahoo.com/news?tmpl=story&cid=509&ncid=509&e=4&u=/ap/20041107/ap_on_bi_ge/ebay_phony_bidding
8 Ebay sellers were ordered to pay more than $90,000 in restitution for bidding up their own auctions.
I have found people doing this and reported them to eBay; one person was suspended for a week. Seems as if it would be easy for eBay to catch the people that have multiple accounts registered in their own name. I am sure there are a lot more out there.