I think I posted one part in a different thread about comparative ethical behavior in chinuch and general jobs. A lost post, $1 reward for finding it …
another aspect – comparative effect. An accountant may lose some money; a doctor – someone’s life, teachers/Rabbis – someone’s neshomos … To invert a famous comparison that respect to a Rav is more than to a Parent: giving olam habo v. haze: then a bad teacher is worse than a bad parent; if a mother is tired and does not want to feed the kid, or father watches TV all evening, the kid only loses out some olam haze; but a teacher who is not inspiring loses the kid.
To admit, a part of current system of keeping low salaries is designed to only keep dedicated teachers. As one principal argued to me that his teachers might make mistakes, but at least they are not malicious: “they are not here for the money”. This might have worked earlier, but now there are so many people who do not have other job prospects that they are going into chinuch out of necessity. Again, maybe OOT gets it worse and things are different in the heart of Jewish civilization.