Basically, with WoW hacking being rather prominent what would happen if you got hacked on your D3 account? Assuming your account is tied to a Paypal account if Blizz doesn't have it so that you have to give your Paypal info every time you buy something using the RMAH a hacker could post something for... say $150 and buy it on the hacked account using your Debit / Credit card.
With the info we currently have on the process the RMAH goes through could this be a possibility and how would Blizz handle it if it did actually happen?