Wrong...
I've always had a big thing on nature verses nurture.
I grew up in the olden days with siblings a plenty, life was pretty tough, my parents left school and went to work.
For context the eldest was naturally very clever and the school wanted to push them to a better school as they were so gifted. But the parents were worried how fair it would be. Out of 6 children 1 was really gifted, another somewhat gifted, if I think about it, each had their own talents. So one that wasn't great academically, was amazing at sport.
When I had DC I got everything ready, like the perfect childhood in my eyes with every resource a child could want. PFB not that fussed and has to be nagged, PSB fussed but works really hard.
On the other hand I knew children that went to private school who were challenged, it was money wasted in a way as they struggled alongside more able peers.
So to think that private schools are full of your next Einstein, I would say that assertion is wrong, there is a broad spectrum of students.
I remember a friend a year older than this other child, friend was at comp, other child at private school. Friend would tutor them or get paid to do work. This was Ye Days of Old. I don't really know what they did but I remember exasperation that you could put the answer in front of private school child, they literally had no clue.
You can have all the money in the world, but if a child isn't interested you have to take it as it is. You can have all the books that would have been your dream collection as a child, but if your DC doesn't like reading you can't force them.
This is coming from a parent who supplemented DC's learning as much as possible. Something which wasn't really around when I was a student.
Back to what I was saying at the beginning, our family was lower working class, so even putting food on the table was hard at times. You didn't have tax credits back then, you had your wage and that was it.
Going slightly off subject, considering families of old would have 10 children, it makes you think how they survived without the additional money you get now for DC.
For me there is nothing worse than seeing a typical working class family moan about money, but then their DC is wearing brand new designer trainers. It's not something I've ever bought into as to me it's a waste considering how they grow. The same with designer pushchairs or Mums who have a collection of pushchairs, I can't get my head round it.