What!!!!
We paid for education only because the state provision was so poor. (Admittedly we made our decisions before inner London state schools started improving.) Use of the private sector in London is much higher than elsewhere, and part of it is because there were then, and still are, essentially large pockets where somehow finding the money became the best option. The most popular option if I look at my NCT cohort was to move out of the area, after this it was to rent in another catchment during Yr 6, discover religion or to tutor excessively for 11+ and have kids commute to Kingston, Sutton or Bromley. Paying was then an alternative option. I worked two jobs, and believe me had no time to give, or go to dinner parties. Even then we were probably better off than some others who somehow found the money to pay, particularly at my daughter school which picked up a number who narrowly failed the 11+, and who I am glad to say then went on to good universities including a surprisingly high proportion who gained places at Oxbridge.
London houses the very rich, but there is also a band of "squeezed middle" who do their best to support their children's education.
FWIW, both mine failed the 11+. Life would have been much easier if they, like the DC of some others on this thread, had had the option of Grammar school. I recognise that they are educationally privileged, as a result of our decision to prioritise our finances on our kids education. We accept that this means that other students will benefit from contextualisation, and mine won't. Neither of mine went to Oxbridge. All fine. They had a good broad education which they enjoyed, and which has set them up for University study and hopefully employment, along with an understanding that they have been lucky and have a responsibility to contribute to society.
I saw a friend at the weekend who I have known for a very long time. Neither she nor her husband went to University thought they now run a successful business. I have not doubt that her kids are just as bright as mine. However when I asked about her 17 year old's plans she had no idea other than she doubted he would go to University. Neither of his elder brothers did, preferring to go out and earn as soon as they could. It turned out she was not sure which A levels he was taking. Education seemed to be a matter for the school and the boy.
If I look back to the kids who my DC knew at primary, and it was a school with a reputation for having a lot of arty parents, the real predictor of what the children are doing now is what their parents do. Their parents ability to pay has not greatly changed these outcomes. Children of professionals have taken sensible degrees, public sector workers, like us, have DC aiming for the public sector, and creatives have children who have tended to leave formal education earlier even if they were very bright. (One thing I noticed was that many of the very brightest kids had creative rather than professional parents.)
We all do what we can for our children, depending on our own backgrounds and circumstances. The judgmentalism that creeps in can verge on offensive. We have never bought a car, and currently drive a 16 year old family hand me down Toyota. Some people presumably judge us on that. Others judge us for having used the money saved to pay for education. I really don't understand.