SJS-
Sounds like a cycle of doom. On the one hand you have the well-educated child who grows up and qualifies for a high-powered job with a good salary. This person will do likewise for his or her children, and be left with $0 after-tax, after-tuition.
On the other hand you have the under-educated inner-yeshivish-city kids who most likely will never command a high enough salary to afford Teaneck, and will live in a community similar to the one they grew up in. This person will send his or her children to a similar school and be left with $0 after-tax, after-tuition, after scholarship.
What’s the advantage?