I have a degree in education. My dad, wise man that he is, constantly told me I'd never make enough to pay for my education. He was right, but I was all, "Oh dad, I'm not doing it for the money, blah, blah, blah." I made it 5 years and realized that money actually did make me happy. My starting salary was 21k in 1991, and I think I would've capped out at 40k. I got tired of not having a lot of money to play with, so I went a different direction. I'm so glad I did. Even though I think my degree is a joke, my work as a teacher actually helped me in various careers where I had to patiently talk to clients and explain things in ways that made sense.
I was lucky. I taught in a middle/upper middle class neighborhood in TX where parents expected their kids to behave and make good grades. They weren't perfect, but they were pretty good kids and I had fun for awhile. I'm sure a few teachers were part of a union, but that wasn't a popular topic, and I don't know anyone personally who was a member. I would've left sooner if I had to put up with that.