So after eBay takes its cut, I am not much ahead.
It will pale in comparison to the losses you are going to experience once the charge backs by the scammers start to happen..
If the seller is able to prove he shipped a physical item via a USPS tracking number, will paypal not side with the seller on a dispute? However on a digital-only transfer of bitcoins, I would expect paypal to side with the buyer
From my recent experience with PP they will side with the scammer almost every time out of the ten or so that did me one was rejected. What is guaranteed to happen is as soon as claim is filed the money comes out of your PP account till they decide if the scammers claim is valid with the most common claim being my account was hacked and I did not purchase the item this one gets approved by PP every time, again in my experience with it others may have a happier one than I had but I doubt it.