To answer the first question: no, not personally. To answer the second: that really depends on the person and what their dream in regard to teaching entails. What exactly do you mean by rewards? Financial rewards? A good teaching experience?

Anyway, take a look at this infographic:

I was a for-profit English as a Foreign Language Teacher, which meant that I had bottom lines to think about. I also had to figure out how to market the courses I created and how to keep asses in seats, plus creating an experience that was effective and enjoyable enough that students and corporate students/companies would talk about me to their friends. It's a lot different that teaching public or private school.

That said, for-profit teachers have to deal with a lot of the same stuff that regular teachers do: class chemistry, how their student's days have affected their mood, administrators that don't know what they're talking about, unreasonable requests from parents, people expecting the best education humanly possible for the minimum amount of compensation . . . As I was a for-profit teacher, my line for that last part was, "OK, you only want to pay me half my rate? I'll teach you at half my ability."

Anyway, I hear good things about Scandanavian countries as far as the balance of compensation and good experience with students. I guess I wouldn't mind teaching at the university level again, but if I did do it again, I'd definitely shop around a bit first.