I'll guarantee this seller has no form of "buyer protection" in place. It takes a while to get that set up and anyone out to make a quick buck will not bother taking those steps.
That Paypal allow you to do that is a disgrace IMO, but as it's owned completely by eBay they don't really care. if any high street organisation had the same levels of customer service as eBay, they would be out of business within a year.
Chas has hit the nail on the head, it's far too easy to get out of paying anything back. And Norman, your social interaction skills leave much to be desired. However, I appreciate your well thought out criticism and shall take it on board for the future.
I hope you get your money back, but experience, and I have over 50000 transactions on eBay, tells me it's unlikely.