Yep, I three-box on Live. I'm back from a long hiatus, though; I stopped playing towards the end of House of Thule, and my characters were still catching up at that point. Now I'm about six expansions behind
[You must be logged in to view images. Log in or Register.]. Currently Gribbling my way to 90, and then I'll do HoT progression as far as I can go.
But now that my shaman is 30 and able to do more interesting things, I'm playing less and less on Live. Being untwinked, root-rot leveling was painfully slow (even with Canni), so it was easy to switch to Live while medding. Now, not so much.