The reson on why it is not allowed is not just there is no way for the staff to check on it, but basically it breach the term of service of those said games, the details you could read it here: http://forum.toribash.com/showthread.php?t=91739

Also, the scam handling would be a hard case i would imagine. Not in the case when you give the tc but not didn't receive the said items. Toribash staff has no power to compensate when you lose the said item when you didn't receive the tc.