What would have been really bad is if the seller used another account to drive the bid up.
In the past when we were buying a lot of motorcycle parts I noticed that one seller who always seemed to get much more than other sellers did always had the same person bidding on all his stuff, but that other person only won 2 out of over 20 items. Luckily that was before ebay starting blocking bidder names on "private sales" so we were able to tell and just stopped bidding on his items. You have to be so careful on ebay, but I still love it.
ps - I caught it before hitting confirm, but once when trying to check shipping I accidentally clicked the bid button instead of the shipping info button and luckily caught my bid of over 22000 before hitting confirm. (I had entered my zipcode as a bid amount) It kinda scared me, lol.