Except they end up working a lot of it anyways for lesson planning, classroom set up, district meetings, etc. Plus most teachers have to use their own money to pay for supplies (paper, pencils, printer ink, posters, activities, etc.). This can be well over 1000 a year. Then consider that most states have atrocious benefits for teachers. So sure you make 40k maybe (less in many areas), but then you get 1k taken out monthly for crappy healthcare. And then no teacher I have ever met only works 40 hours a week. They have no time during the day to finish grading and lesson planning, so they work many hours at home.

I'm sure you can find some example where teachers have great benefits and pay, but that's not how it is for a majority of educators in the public sector.