Obviously it's got the potential to throw massive bills at you, but I am reassured by the sellers honesty in stating that it needs a new air con condenser. In fact, I don't think I've ever seen that before. Perhaps he means it 'needs a re-gas'?
Its easily worth the money asked, but the way ebay psychology works, he started the bidding at too high a price. Start low - get high prices. Start high - get nothing.