This is completely normal and is not an indication of the complete unraveling of the country
A quick search shows that the average cost per student in Arizona is $8800 in public schools and $10300 in private schools. A $1500 difference doesn’t seem that bad, but a $3300 difference from the get-go, which will inevitably widen as the voucher is eroded down, is a categorical difference.
Tbh I think that a progressive homeschooling collective could do a lot more than many private schools do with the same funds.