My buddy for many years received bad news today. His World of Warcraft account, with multiple level 60 characters, is banned. Why? They cite logs that show logins from multiple IP's all over the place in the last few months. The kicker: they ban it just before the expansion, but release the ban on opening day. He buys, installs, and activates BC. He logs in for a few hours, and then gets kicked out. Email arrives: they have re-reviewed and decided the ban is valid, after he spent his $40 on the expansion.
Maybe a good reason, assuming it's being shared, power leveled, or used as a farming account... but it hasn't. He travels. As a tech for a very large computer company, he is all over the place. Sometimes he is inside the company network, playing through a proxy... whichever one is available at the location. This can be just about anywhere on their humongous network.
I know he is not botting or sharing accounts, selling gold, what have you. He is just everywhere, sometimes 2 or 3 locations a day, wherever the plane takes him. And yes, he plays a lot. As he often fixes the issue in minutes, then has to wait hours to monitor that the fix is good. What better way to pass that time?
So, after multiple calls, and detailing his travel and networks nearly to the minute, they finally reply that the account will not be unbanned, and they will no longer address it. They did, however, refund his BC activation code.
The moral of this story is: If your work requires a lot of travel, leave your WoW at home: they do not want your business.