Maybe they could get one of the hundreds of thousands of jobs that allow you to work and care for your own child sassy? You know, like everyone else.
The young boarders at my school were usually African, Asian or Eastern European (particularly Russian). Their parents did high powered jobs frequently for the diplomatic services, IMF or World Bank. They came from countries where it wasn’t just a case of just getting another equally well paid job. They were hugely lucky to have got the opportunity and if they turned it down they would never have had it offered again. If the worker was the mother these were often countries and businesses that gave zero flexibility or help for maternity. It was literally doing that or poverty. Because of their jobs, their children couldn’t be in their home country because the threat to them from blackmail, kidnapping and extortion was too great. At one point, we had several daughters of a man who had been fairly elected as President of an African country but the previous incumbent wouldn’t go and put the father in jail where he later died in suspicious circumstances. His children would probably have been killed or harmed if they were in that country.
I believe a couple of the junior boarders also had mothers who were models (I think one was the daughter of Miss World or Universe or something) and their mothers were travelling most of the time and also had a limited shelf life in which they could earn money plus no support for motherhood or maternity in their profession.
A handful were from forces families posted in places deemed to dangerous for children.
Quite a few were children of women from quite poor countries who had managed to train up to get very high paid and skilled jobs overseas which made a huge difference to the lives of them and their families, but again, the money angle, a poor country - they felt safer putting their daughters in a school rather than leaving them with relatives as many tales of children fostered to relations and then exploited as slaves or worse were around.
I believe there was one child there whose mother had quite a serious mental illness and it was deemed preferable to a state funded care setting.
I don’t remember anybody just doing it because they felt like it. It was a bit sad sometimes yes, but still understandable in most circumstances.
I boarded from 11 and remember them as some of the happiest days in my life, I’m still in contact with many of my teachers.