Parents who themselves have gone through the day school system recognize their value and no longer need convincing to send their children.
The day school tuition crisis is not new. It has been brewing for years. School costs continue to rise while unemployment and underemployment remain high. And one also needs money to live in a neighborhood with shuls and mikvehs, to buy kosher food, to make proper simchas, to cover Yom Tov expenses, etc.