Ohhh noooo! This happened to us too Stupid bastard made a good bid, then emailed me to tell me the car's mileage was too high (he hadn't even asked what it was when he emailed me!).
eBay didn't make us pay the seller's fees, but they did make us pay the listing fee. And the stupid tosser left negative feedback for me (I got that removed too). And they suspended our account while it was all being sorted out too. That was my first (and last) experience of eBay.