Since we're mostly about multiboxing here, just what about MB'ing makes it worthwhile and satisfying to YOU?

Is it to make a game we already love even more enjoyable? Or something else that only MB'ing can provide?

What does this say about the underlying MMO?

If you were forced to go back to single-character, but could in turn force the devs to change something about the game, what would you consider to be a fair trade?