It is somewhat of a myth that sight unseen means that you have bought a lemon - this is true at times but, it is up to you to investigate seller properly before you go ahead with a bid, remember the final decision is up to you, he will surely do the same to you!.
However, if it is any help I have successfully bided on two cars now from Ebay over a period of three years and each time they have been up to scratch - even with the transport they have worked out better deals than if I had been to a dealer here in Adelaide.
Remember do not buy off any person if you are unsure and trust your gut feeling about him/her, better to drop a sale than lose your cash and always pay by Pay pal and you are protected if the seller does not deal with them then it is your responsibility, I leave them and go to another who does.
A Mike's philosophy!!!!!!!