As a buyer, I could still win a claim against you for bad shipping, though. We run two repair shops where we buy a LOT of parts on eBay, and the way some people ship things is atrocious. We've received laptop keyboards with keys hanging off, LCD screens that are broken--even video evidence wouldn't be sufficient for you, as the seller, to win the case if poor shipping is involved.
It's bad for sellers, too. Imagine shipping a $400 LCD (this is approximately how much the MacBook Pro retina screens cost) and the buyer receives it scratched or broken. It happens alarmingly often. As the seller, the only thing you can do is replace or refund. That's why you basically have to make a ton of profit off of these--or really learn how to package them (many sellers won't bother.)
It's bad for sellers, too. Imagine shipping a $400 LCD (this is approximately how much the MacBook Pro retina screens cost) and the buyer receives it scratched or broken. It happens alarmingly often. As the seller, the only thing you can do is replace or refund. That's why you basically have to make a ton of profit off of these--or really learn how to package them (many sellers won't bother.)