In reply to Rob Exile Ward:
As a BASI instructor, i'd say if you like teaching then give it a whirl. You'll struggle to make a living out of it, but I know a few people who spend acouple of evenings a week teaching at the snowdome just for the love and nominal pocket money.
However after a BASI course I found that I looked at my own skiing in a new light and went on to teach myself to be a better skier too.