Who pissed on your chips OP, Piggy is making sensible points. We are not your students, so your 'put your hand down, and be quiet' attitude doesn't work here.
As others have said, people like the classroom; they might be married to a higher earner whose own job mandates the family home is in a certain place, so can't move schools or areas for promotion. They may be juggling job and family.
I went into teaching at 35, and looked at promotions, but there were none in my school, and as the set up I had with ease of doing the school run for ds, a fairly short commute, and a reasonable SLT who were supportive of my subject area and the staff worked for me, the upheaval caused in going for more responsibility wasn't worth it.
I left teaching at 40 to move abroad for Dh's career and am just back. Looking at it now, I don't want to teach again. I loved it, but I don't need the holidays for my child any more as he is 24. I don't need the stress levels, and I don't have the energy or patience to deal with the crap that goes with the job.
I don't think teachers are well paid for what they do, and like a PP, I spent a lot of my salary resourcing my classroom. Dh was also public sector and his employer would not have expected him to put his hand in his pocket to provide resources for his workplace ( mind you, torpedoes are more expensive than biros).