Thanks for sharing your thoughts on this topic. I had a similar epiphany when I worked for an ad agency. The hours were brutal, and since we were straight salary with no overtime pay, the hourly wage was pretty pathetic. Because I was working so many hours, there wasn't really time to pursue a side hustle gig. I switched industries and am happier these days.
I think you also make a good point about the expectations placed on teachers. It seems to me that we often ask too much of those in "giving" professions. Just because someone chooses to teach for a living, work for a church, or works in the service sector, it does not mean that person does not deserve a life outside of work! Good for you for saying no to some things. If you don't, you could easily get burned out, and it's healthy to have some boundaries.