We use eBay all the time to buy and sell. I've only had 2 problems. Once as a seller and once as a buyer. If eBay suspended you, then you messed up, didn't follow the rules or something. Contact seller support here
http://pages.ebay.com/help/account/R...VerifyPSU.html
Find out what you did or didn't do. Give 'em your side of the story, show them proof you had a dead beat bidder (emails that you sent to the bidder requesting payment)
They will work with you.