Ericsky, I don't offer refunds when I sell either. My items are authentic so why the need to offer a return policy.
You do have an option though. If it is being sold as original or authentic and you buy it, right after it arrives, post the pics. If thumbs down and fake, you can complain to Ebay and would win. But you have to do it within a month to make your complaint. It is a pain in the butt though. The best in such circumstances is to bypass the item all together-much less a pain in the butt.
Interesting discussion before. "Rare" is dependent on who sees it as rare and wants it. The term is used zillions of time in the hobby and in my opinion, overused. Try selling it though.