I agree with Lloyd here. I doubt there is really anything amazing you would learn from paying for pokerschool that you wouldn't learn for free from browsing and participating in this site. In particular I refer you to the "anthology of wisdom on MTT's" which should answer most of your questions on the theory of MTT's.

Perhaps even more importantly than that, I have found that in the month or so I've been here I have learned heaps about how to play specific situations. Just a browse through the forum will turn up many pearls of wisdom about how to play situations similar to ones that come up time and again.