300K would barely cover the cost of an extra bedroom per child. Let alone the fact that some places around the world require one to send their child to private school, fund university costs etc.
Yes some parents would rather send thier kids to a private school and to be frank, we do, but that is a choice not a requirement.
I don't know any place where the only option for schooling is an expensive private school.
Saying that kids are not financial worth it, then constantly moving the goal posts to create a strawman to justify it is a waste of people's time.
If someone wants to argue that kids with special needs who require private schooling and a fully detached house in Palo Alto are expensive and a stretch to financially justify that is one thing but let's get a clear play field so that the goal posts are not constantly in flux.