Just stay away from those scammers.
+1 for this part of your statement
additionally I would say anyone trying to sell bitcoin at this point needs to just have the buyer send the money as a personal gift, then it is both irreversible, AND you just cut paypal out of getting a portion of your money XD
I do this for anyone wanting to put downpayments on goods I make and sell, and it works wonderfully, the last big payment they make I let them pay normally if they choose but if they are willing to pay the same way on the last payment I just cut them a deal on shipping to give them back the fees paypal would have taken, now mind you if you do a LOT of business this way, paypal will catch on and probably screw you, but if you are not using them often for now, this way you should be good.
also you can sell a paper cold storage wallet and mail it too them first class with tracking if you want and just use paypal to make the shipping label cause a tracking number for something sent to someone is what they are looking for mostly when trying to figure out if someone is scamming someone else, so no shipment after a period of time, they get anxious and proactively react, before the buyer can complain.