Indeed, that is why I am so hesitant about it. However, you still have the security of PayPal if you purchase things on E-bay so should it be a real scam then I suppose you will still get your money back one way or another.
By the time you realize that you have been scammed and Apple will not honor the eBay AppleCare, you will be well out of the PayPal dispute timeframe and any chance of getting your money back from them.