virtually same thing happened to me. I emailed a seller to ask few things about the bike and never got a reply. I put a bid in anyways and won.
Checked messages after winning and as well as the info i asked for he stated that it may be sold on another site dependant on what it reaches on ebay lol
Well i won it 2 days ago now and still not heard a thing back from him. Apart from bad feedback there aint much you can do.
Won another frame and forks yesterday for a good price and that buyer hasnt got back to me either.
When i sell summat i email the winner straight away to find out whats happening etc and to say well done. If they dont want there stuff to go for low prices then they should put on a reserve.