School Taxes

I'm obsessed with the cost of school taxes. They seem outragously high. There are approx. 3000 students in the Nyack school district. It costs $22K with 18K coming from property taxes, to educate each student. The average cost to educate a student in New York State is 18K with 9K coming from property taxes. Something seems unfair. if you don't believe me - see for yourself.
What's wrong with this picture and why is it so expensive to educate a child. You could pay 1 person $100,000 to educate 5 students. Hell, I'll do it for $100,000 for 6 hours a day. It supposed to be cheaper when working with quantities. Our school system must be flawed.