Are they worth it for aspiring instructors? At their site I see they offer an Associate course which could hopefully get me out of the "knows just enough to be dangerous" mode and I would be able to apply it to help folks with their skiing. Mostly I find the topic very interesting and would like to learn more. I don't see me setting up a shop or working for one (would interfer with skiing) but I find myself usually researching as much on boot fitting as I do skiing.
PSIA also offers a workshop and maybe that is the way to go but I don't have much info on it other than it is two days.