Well, sad to hear. Idiots will always be idiots.
Maybe next time trade with someone who has a good ratio.
At least you should have some personal information about the guy?
From the paypal info I mean.
As long as you have proof you can pretty much bust the guy, but not so many people bother spending time on that.
Good luck next time, over and out.
I got much more... I gave him 500kk and he payed for those, than 1b and he ran away with. I got items and alz but I won't go first anymore ~10b in items+alz