actually trickerg I don't really understand your point.
I don't know anyone in RL who 'bangs on ' about private education - it seems to be a MN obsession - but I would be very surprised if anyone said that they were happy to pay for an education that was exactly the same as the one they could get for free.
One of the main reasons that two of my DCs go to independent school - when we have some very good state school locally - is the range of activities and sports etc arranged and available duringthe school day and/or within school supervision.
Having a DC with SN I could not take DD to gym or swimming or ballet after school, it would be impossible. It is worth it to me that these are done at school either during the school day or after school. She does , for example, 6 hours of gym a week, at school and under the school supervision. I could never do that as an out of school activity.
Were I in different circumstances and could cover gym, rugby, cricket, ballet, drama, swimming, shooting etc etc via out of school activities clubs I would chose a school with very different criteria . Or if one of the good local state schools offered those without my having to attend then I would jump at the chance.
Of course not all children need out of school activities if their family circumstances mean that they are busy and engaged etc at home. For my DCs everything we do is affected by my need to care for DS2.
So 'added value' and extras are a big part of why I pay. But I don't bang on about it unless I am asked