Those threads are so pointless. Some think it is a waste of money and some dont. It snoknto disagree.
What I would say is: a bad private school (amd there are a few of those) is a very expensive amd damaging education; a bad state school is a horrible place to have to go to but for a lot of kids it is a reality in which they have no control over; a good/great state school is fantastic if you can get in ie. catchment and house price; and a good/great private school is fantastic too if you can pay the fees.
So either you pay the catchment or you pay the fees. It is a choice. There is no right or wrong.
Ultimately most of the children today are VERY lucky to have parents who care. Most we ll do well in whatever industry they choose.
The OP asked for the proportion income spent in fees. For us it is less than 10%. It is a choice to spend that and so far we re very happy with the value for money.
But looking at fees only is painting a very very small picture of private education and I am not talking about uniforms and school trips. I am talking about everything else. If you are in a nice family oriented school like us you and your children will make lifelong friends so then you add costs of experiences (birthday parties, talking a group of kids to pizza to celebrate winning a tournament, or go ape, or whatever), cost of petrol (lots of matches, expectation from the school for parents to help if minibus is busy elsewhere, etc), lost of driving around (granted we carpool but when we had to change the car i upgraded to a 7 seaters and my car is rarely empty), lots of time taken by school (concert, plays, matches, etc luckily for me I am free lance so I can be very flexible at a moments notice), lots of week end aways (we dont go to all), dinner parties (we re invited and we invite back), lots of kids activities in and out of school, and so many more.
We have great fun and wouldnt change anything for the world but it is time consuming and yes expensive.
So please do the sums. And if you have a good / great state school you can have the same experience with like minded parents for less money 😉