I came out of a public school system, albeit a very affluent area (with 5 non-english languages taught as electives, and a lot of AP courses (which at the time I was in high school, was actually rare.)) I could easily meet with teachers about half an hour before classes start in the morning (7am,) up to an hour and a half after the end of the school day (5pm,) to include lunchtime, study halls, and at least one period twice a week that they would keep open during school hours for student help. There were teachers that really worked with the students. Now perhaps I am a bit spoiled, but what was asked of the teachers from this district was expected in the district I graduated from. At minimum.
However, as well as they worked, I knew my district's salary for teachers at the time was abysmal. I remember seeing one of my math teachers (a favorite of students,) working summers delivering ice, as he wasn't allowed to teach the summer courses, and he wasn't paid for the summer. I can only assume other teachers were doing odd jobs as well in the summer months who weren't teaching summer school. How they kept the talent, I have no idea.
I have not heard of anyone outside of the administrative people and maybe principals earning anywhere near $70k/year in education, at least in pubic education systems. I know it has been a while since high school for me, so I concede I am out of touch on this matter.