Not sure if this had been mentioned before, but we had a very stark experience of this. One of our kids was potentially going to go to a private school. My main concern was that we would have some feeling of entitlement, that because we had spent so much money, we could not have a single concern about whether it was "wasted" or not. The way I put it to dh was that if ds decided he would be most content becoming a barista, or working in a supermarket, or in the council offices, or whatever, that was his choice. I have just chosen random ideas there btw.
DH was quite shocked, and I realised he had expectations even before this conversation!
I used to live next door to a family who had sold the family house and downsized considerably, so that their oldest son could go to Eaton. I was only a teenager at the time, but I vividly remember the boy saying"no pressure then", and he definitely wasn't joking.
My son has nearly finished there now, and has absolutely loved it. Unfortunately he has now been quite unwell for 3 years, so is unlikely to do well in his A levels. One of the GP receptionists, who knows him, and his uniform, made some remark about "how awful for you, all that money you've spent".
I don't care. If he recovers, and continues to be a nice kid, and eventually a nice adult, I'll be happy.