I agree with Wolf. If vouchers for working (paying) parents ever kick in the school will say, “oh, the X thousand $ you’ve been paying till now was really X thousand below what it really costs us, but we could’nt ask you for any more. The X we are getting now is going to cover the X thousands you owe us for the last X years.”
Not sure how the schools handle the folks getting the poverty vouchers, but someone who is currently paying $ each month? Get a tution break? Never gonna happen.