Yeah, I've never questioned that one. Teachers work their butts off. My sister is a new (second-third year) art teacher, she got to develop 8 separate curricula over the last year and a half, one for each grade level.

Kinda like my department being one of the better paid (and less higher-degree-holding) in the university - we're also one of the only always on call and who work in the office year round, including when the university is closed.

Less obvious things still exist.