What are the pros/perks of playing with multibox?

I have a couple of questions
-What are the pros/perks of playing with multibox compared to playing 1 single character, the group bonuses? is there anything else?
Let's take my main character what benefits is he taking of multiboxing vs solo playing?

[bob]

Benefits of multiboxing generally are:

• If you want to do content that requires a group, you don't have to wait around for one.
• You get to choose the classes in your group.
• More Crappy LootTM.
• Kitting out one toon faster - unfortunately if you are running 4 toons, the kitting out of all 4 will take around the same time, but at least you get to choose who gets what, rather than end up in discussions with people you barely know.