I had 26 accounts banned for 500% Run Speed, Underground, farming with gatherbuddy. A couple of accounts survived. These were accounts that had never had a bot run on them. From this I concluded. Yes they used my ip address to link the accounts. No they did not ban accounts I did not bot on. Which means they had to investigate each account. After all of this I'm still using the same ip, still botting multiple sessions 24/7, and still not receiving another ban. You people are way too paranoid about this stuff. They won't start removing accounts that didn't bot for guilt by association until they are to the point where EverQuest is now wanting to shut it down. They have been doing this and driving people who didn't even get banned to want to quit as well for the newly established business tatics. World of Warcraft is quite a far way off from this stage, so for now I wouldn't worry about hiding your ip.