Look up the total expenditure on education per student in your state, then do a rough calculation of how much of it is actually going to teaching students (facilities, teacher salaries, school supplies). It's usually not that much and school districts spend it on nonsense instead. There's probably enough money already so adding more won't help.
I live in Arizona, which regularly places last in education. We also happen to place 49th in spending, at about $10k per student vs $15k on average nationally.
I think you might be right in some situations but wrong in most others.
AZ average students per class is 18. $21/hr for 2000 hours is $42k. Double it to overaccount for total cost of employee. Where's the $96k remaining going?
I'm not going to analyze further, I don't live in AZ. But you should check out the actual answers. Teachers could make more without spending more on education. Or rather spending more on education and less on "education"
Teacher salary is only one cost of educating students. You also need to have school buildings, maintenance staff, administrative staff, etc. Stingy states like Arizona are not overspending on education. They need to minimize waste AND spend more to adequately educate their children.
