The band director in the upper suburban schools with private lessons and middle class students getting a 1 and someone from the inner city or a small country school with many more challenges getting a 2 maybe did the same things but the scores don't reflect it.
Companies with profit margins or sales goals have very clearly defined profit/loss/worth measures. It's much harder to prove profit in education. Especially since much of our work as teachers doesn't truly come to fruition until well after the students have left our classrooms. How often do we HS directors talk about the importance of that 1st year in band setting up or destroying the high school program? Our success is very much based on what that 6th grade director did but we don't see that until those kids are sitting in the 9th or 10 grade and amazing players with fundamental sounds and technique.
I don't think it's teacher's aren't valued but that it is very hard to equate pay to profit in something as nebulous as knowledge.