[brewdad]

Parents putting their kids in K-12 private school aren't optimizing for cost. They are optimizing for exclusivity and educational "quality". If their school just became more affordable to the unwashed masses, they will gladly pay the premium to keep them out.

[coffeecat]

That is true for some subset of wealthy parents, and if they want to pay extra for exclusivity, that's their choice. But I think it's reasonable to assume that the parents of the 90% of K-12 students who attend public or charter schools [1] are prioritizing cost over exclusivity.

It's true that many families will pay more to buy a house in a good school district, but I suspect that the school itself isn't the whole story: rather, many people interpret the school district's reputation as a proxy for the safety of the neighborhood and socio-economic status of its residents, as well as a proxy for their own socio-economic status.

Ulimately, I suspect that with the free market voucher system I described in my parent comment, legacy private schools would continue to charge outrageous tuition. But I think we'd also see some new, possibly virtual "bang for your buck" schools which would compete on price and which would be exclusive due to entrance exams and high academic expectations for enrolled students.

[1] https://www.edweek.org/leadership/education-statistics-facts...