Lol I play on my main acc and also bot on it. My character is online pretty much 22 hours a day, been doing this for the past 2 months, I play 10 hours bot plays 12.
i do this as well. the banning likely comes from the selling of gold...and when they check the logs, it's quite evident due to the played time. i still firmly believe that blizzard doesn't care if you are botting...it's how you are botting that they care about it.