cantoresq: In those cases, they have extras over Charaidi yeshivas (Gyms, sports, better english, nicer building etc.) which accounts for much of the additional cost. It may be needed to lure in children who would otherwise go to public schoool.
Mrs. Tzippi: In that case, the father practicly abandoned his child. In my scenario the child would come home every day and be able to learn from his parents or a tutor. In addition, I can imagine the parents not raising the money within a couple of weeks. If they don’t try, then the child has the din of a Yasom and then different halachas apply (i.e. he becomes a ward of the community).
Jothar: Not a joke. It is true, and I imagine people have gone back to kollel to avoid tuition.