Kids are cheap when you are poor because you aren’t seeking status. A home in a highly desirable suburban school district won’t support 12 kids in the lifestyle that people demand in those places.

Whoever has custody of the kids is fine. The social services benefits scale. They won’t get rich, but they’ll eat. People will be OK. The only people who lose are stupid men who have multiple children with multiple women.

Once you have a little cash, the formula changes completely.

You also have the state which pays for most of the top line expenses of having kids. Once you start making money, those benefits don't fade, they instantly disappear entirely.