What is grossly understated is what mechanic him pay for tuition. They're paying about $5k per child.
If the rest of your post was directed to me, just know that I am on the side of the mechanchim.
We need to incentivize chinuch as a career choice as much as we can, to get the best rebbeim and moros for our children.
Maybe I'm wrong but I find that the local yeshivos have the best rebbeim around. It's a known thing that Rabbi bender used to take the best rebbeim from other communities (obviously paying way better). At this point, he has his own talmidim that he groomed into unbelievable rabbiem. Along with the higher caliber rabbiem comes higher pay. In turn, tuition is more.
Of course once Darchei raised the bar (in regards to how great their rabbiem are), the other yeshivos had to follow suit.
/.02