I witnessed today a merc 50 level bot on Rishi literally coming from thin air and moving towards the slicing box and disappearing. He was not logging off because I had him targeted and he was moving away according to my tooltip. Very fast. I watched a tv show on my other monitor and saw it happen at least 6 times. I took the box first of course.
The OP is useful, but bots seem to get smarter now... somehow. I can't add them to the friend list at all. Right clicking doesn't give me an option and /friend says character doesn't exist. /who doesn't show him at ALL even if I am in front of him. I am sure I got the name right too. I reported him anyway, but I doubt that will do anything.
Probably someone multiboxing rather than botting. It's not exactly forbidden if I recall correctly. It's not in WoW at least.