Yep, a lot of buyers have scammed and basically blackmailed honest sellers, and since Ebay doesn't allow sellers to leave Negative FB for buyers anymore the slimeballs usually get away with it.
When a buyer pulls that kind of scam you might want to consider adding a post to tPF's Ebay forum, either to the Blocked Bidder list for non-paying buyers or just as a stand-alone post to warn other Ebay sellers and also so the buyer's name or ID will show up in a Google search.
http://forum.purseblog.com/ebay-forum/
Sometimes you can get a Negative removed but it involves multiple phone calls and a lot of luck and patience. All too often it's a waste of time unless you mamnage to get an Ebay rep who actually knows their job and cares about doing it right. Not many of those left, unfortunately.