I started multiboxing not for the schedual, personally... Then again I live on disability so it's not as if I have a tight schedual to keep anyways. :P

The main reason I started multiboxing was because I knew it was more difficult than uniboxed play. Sure, it trivializes most of questing. But dungeons? So much more interesting now. I *always* used to tell myself that if only I could be the tank, healer AND dps all at once we wouldn't have wiped on this pull or that. With all the PVE content in my own hands, I have nobody to blame but myself, and that's comforting because I trust myself to improve.

PVP content, however, is why I love and play WoW. Irony that, since I'm on an RP server. Either way, the intense amount of challenge offered by multiboxing is the bread and butter of why I play.