blizzard has its own system to restart a realm if it randomly goes down. As I was constantly sending a specific realm packet to crash their server, for a good hour or so, they finally went in and hotfixed the exploit even right as I was doing it. Funny enough, I was not even banned, most likely was being watched after that. I can say for sure. In other cases regarding gold, I was banned, even had several of my accounts banned linked to the same IP.
Its best to change out your IP, and have every once in awhile Chinese IP log int your account when you move gold, so if you do get banned, just claim you were hacked and if they check the IP logs they will see it must of been Chinese guy who logged into your account and took your stuff. Its a good method to keep your account after big gold sales.