The biggest strengh of Charedim is their dedication to Yiddishkeite, but it is also their biggest weakness
They are willing to do whatever it takes to send their kids to Yeshivas , however most people unfortuantly are not willing to do so. How many charedim are willing for forgot new cars and vacations (Normal cars and Vacation, not luxieries) to send their kids to yeshiva and forgo good secualr education in order to do so.
Unfornatly many non charedim are not wlling to make those sacrafices and in fact quite a number of kids who attend MO schools arent even religious (Kids Charedi schools would very unlikely to accept) however in order to accept these either Non-relgious or semi-religius kids the schools need to have education that is equal to the secular education at a public high school and that costs money
If you ask many of the non-religous or semi-relgious parents would they send their kids to public school or yeshiva if an Ivy League school was at stake and going to yeshiva might not get them into Ivy league, they will send to public school