Something else to consider these days is that making an endgame raiding capable character means you're going to be putting up with pug hc groups.

All the changes that cata brought in to heroics and class mechanics means that multiboxing is not going to be usable to farm too many of them.

I'm guessing any boxers who are at the point where they can even do some of the cata heroics, have already geared their characters by playing them solo.