Well...i just came up with an idea...it's a bit common sense of scamming but well just had to post it.
If this have been posted before, FLAME ON 6):
I was just thinking :
/2 WTS: 100 [Mark of Sargeras] 50g !!!!
Wictimnoob[whispers]: ok, can u COD it
Me: Sure
Sending COD with ONE [Mark of Sargeras], with COD as 50g.
They se the [Mark of Sargeras] icon and the low price of 50g (depends on server prices)
and they Accept...maybe they dont see it(only one) in the start, so u can send tha gold to main, and delete the Alt :P
Just a theory :P