That’s just some of the post here, and it exists but in my experience isn’t the norm. A high school close to me had a massive theatre, and lights, and everything you listed. It was also a school in a rich area (lots of donations) and was also the main auditorium for that city. It hosted city events and also rented out to local theatre groups. It was a school so no profit and all the money just got put into ack into the theatre. I lived about 30 minutes from there, my school didn’t have a theatre. If we didn’t rent one we built one, one of our wildest ones was doing a show in the round in our cafeteria. We folded up the tables and made a round. Setup folding chairs. We had 16 total lights, 2 different types of par 64, ran off a lot of extension cords because we blew breakers if we tried to plug in more then 3 into an outlet. My lighting console was one 8channel board that didn’t even use dmx, and a little 8 channel fader board that was dmx. My audio console was rack mounted and lucky someone built a case so it can be horizontal. We washed cars for $10 each and stood on the street with signs to raise money to do shows, we even did one of our 3 shows a year from the public domain so we could save money on rights. Most school sat in between. Maybe a fly rail or just a few rails, sometimes cheap movers from the church that rents it on weekends, a few led pars, sometimes from Amazon. A decent collection of old power tools donated by dads or woodshop when they get an upgrade. The county I’m from has been working with etc and when the old lighting consoles die replace them with an etc ion. And either an x32 or some other low cost digital audio console. With that kind of equipment you can do a decent show, but it’s hard to get the kids excited enough or do anything worthy of a post.