Given how poor physical security is at so many data centres and commercial hosting buildings, there's *already* many cases of people just walking in, unplugging, and walking off with hardware. By the time the admins have taken a couple of minutes to notice that the machine is no longer responding, a few minutes to determine that it is unreachable and not responding to remote power cycling/LoM/whatever, another few minutes to phone the data centre to ask someone to have a look and for that person to get back to them and say "of course it's not responding, there's no such machine" - the machine is out of the building, in the back of a van, and disappeared.