Doesn't matter how they send it. If the buyer calls foul, they'll be getting their money back. If the seller does his homework, he can easily spot 99% of scammers on eBay. Most don't. And even if you do, there's probably a group of buyers who suffer from buyer's remorse after price dropping who will threaten you with a dispute if you don't refund them.
When I was selling on Ebay, I never sold a single BTC or lost a BTC after 50 auctions. I had a specific criteria for buyers, and they never met my criteria. Numerous scammers. I only ended up paying eBay fees for my troubles.
Yes, chargeback is the "I win" button. But I'm going to assume you don't chargeback unless you've been done wrong. See, those people are out there. You just need to do a good job of figuring out who is who.