I guess this is the new trick for fake paypal sellers to make money.

First the deal goes fine, everyone happy.
Then the payment get reversed, when buyer ask refund the seller comes out with his stupid lame excuses as usual.
Next the seller gives lame excuses that he lost so much money.. bla bla bla
Finally the seller offer a stupid deal to refund lower then the ammount paid to him.
Its obvious the buyer will agree, so he wont loose all the money.

I was a victim from one of the sellers here. Just my point of view