Funny choices. Who's really going to post and say 'for fame and fortune'?
Although partly just because you'd sound like a bit of a nut ('cause we all know so many rich and famous martial arts instructors, right? I think it's probably right up there with 'teaching art lessons to kids' in terms of fame and fortune.)
Oh yeah, also the fact that I wanted to be the boss and have people bow to me. And because I know so much that people need me.
I don't operate a dojo, so I can't answer seriously, just amused by the wording of the question. Probably unintentional but it seems like a bit of an invitation for people to brag about their humility and selflessness