What do you mean blizzard did for this the auction house? If I am buying a bit of gold, should I just put an ok item up for sale?
And is in game trading (by joining someone else's game) and trading safe?
I m sure blizzard have create a Tool "Server Side" or have a DB script (server side). And this Tool/Script will save your Trading with everyone. So they can read who what buy.
And you maybe not be banned now but im sure you will be later.
you won't get banned because of buying gold, they don't have the time to look ever single trade, lol. look at athene he gets so many gold free but he don't get banned