Something else to consider as to “how they do it”:
I’ve read enough AM Amitz stories (note: still living la vida kollel even 20 years after leaving, read them from the library, friends’ back issues, splurges for yom tov) about the fathers in Israel having heart attacks over the apts. In the US the equivalent is the 5 ish year plan – 12k for 5 years. You may say it’s a metzia compared to apts, you can pay it out, but it’s the same problem of money one doesn’t have, or is diverting from other kids’ needs, or other obligations. It’s the grandparents’ retirement when the kids aren’t in the position to be helping them.
I have a friend who is one of several dozen grandchildren, each of whom pay in to a fund to support their elderly grandparents. Now that is beautiful. Not that supporting children in learning isn’t but…