Our 3dc are in state schools. Household income around £80k so both dh and I are both fairly average earners.
I've just done some working out and had we made different choices, I think we could have afforded to send all three dc private for the 7 years senior school.
In essence this would have meant saving £1000 a month from the time dc1 was born to the time dc3 turned 16 (which spans 25 years! 😱) It would have covered all the fees plus left a healthy enough balance to cover all uniform/transport/trips/extras.
However, that would have meant pretty much every single scrap of our true disposable income being needed for 25 years straight.
So we could have lived in the same house and had the same cars. But for all of the dc's childhoods there would have been zero holidays or 'big' day trips. Massively scaled down Xmas and Birthdays. Pretty much zero nice to haves, ever.
Essentially, day to day, we'd have been living almost on the breadline - money for essential clothes, food, transport and nothing else. For 25 years.
I know some people live that way anyway (both dh and I grew up like that). But truly, I doubt that there are many average ish earners like we are who'd be willing to make that level of 'sacrifice' for so long.
But it's interesting to think about and to realise just how 'doable' it probably would be for many households, even with 3 dc - if you chose to go without absolutely everything else for decades.