Virtualization doesn't make a difference and should only be use to separate WoW sessions (if you have many accounts) or to minimize the screen.
If you think VMing your accounts are much safer, that is so wrong in many ways. VMing poses the same danger as botting 10 accounts on the same PC, but using more resources anyway. Why bother? Tested and proven, don't bother trying to figure out how Blizz did it, it probably broke a few protocols along the way to detect you, but they'll never tell you. Unless you manage to break down Warden, decompile and see how it functions, it's a big myth.
What if I told you warden is an artificial intelligence from the future sent back in time so it could be more advanced in the future ~_~