You need to scroll down to around the middle of
this
Bit of an odd article and I wonder if he has been misquoted but the jist of it is the Head of a private school (and leader of a private schools organisation) is criticising well-off parents for not sending their children to private schools!
Sour grapes in the current economic climate perhaps? I can't believe that there are that many £3M houses where he teaches (I know the area well...) Plenty of people there may own a house which is worth 0.5-0.75M but in most cases that means nothing to them as they bought their houses when they were significantly cheaper - possibly couldn't afford to buy them now!
Or is he so out of touch that he doesn't realise that private school fees are out of reach of most families, even those of above average incomes in the area his school is in, particularly if you have more than one child.
And why not send your child to a perfectly good state school if that is what you want? Lots of people prefer them for their ethos....