Diversity is great, and the very wealthy are part of diversity. Too many though is a problem imho. Their status and power means that they can punch above their numbers in terms of influence.
There are lots of lovely comments on this thread about DC not noticing status or wealth and all getting along and making friendships based on less superficial things. That is good to hear.
I do think it might feel hard to be "part of the gang," when kids go skiing every year and you cannot afford to do so, etc. How do you build relationships/make friends when you are excluded from common experiences because those experiences are expensive? (I bring this up as an example because randomly 3 families have talked to me about skiing already. My children have never been, not once.) This might trickle down to the right clothes for going out, or costs of entrances at dance places as they get older, etc. I am not sure. But I can see that there is going to be less shared ground than I expected.
Despite generous bursaries and reasonable fees (in relative terms) my DD has met 12 girls so far, and all come from prep schools. She hasn't met a single other girl from a state primary yet. There are bound to be some, of course. But it looks like my DD will be providing a lot of diversity for others.
All those things are just annoyances though really. When growing up, there will always be times when one feels limited compared to friends and peers in one way or another. Learning to cope gracefully is part of maturing.
My real worry is that she will be a bit confused by it all and it will lead her to frustration and bad decisions as she starts out in life. People with access to capital, wealth reserves to fall back on, and fantastic connections can afford a certain insouciance that DD cannot. Those kind of advantages mean a person can hold out for better jobs, offers and opportunities than someone without them. They can also lead to a blase attitude and appetite for risk that DD can also ill afford. Education and loving, emotionally supportive are important factors in life chances, but they aren't the only factors. It will be a disaster if she thinks she can assume the attitudes and strategies of a "rich kid," when she is not. I am sure there are many "rich people," who would protest that they are not raising their children this way and that they share my values and possibly enforce them even more stringently. Maybe. I think all the effort in the world doesn't change the facts on the ground. And the material facts do influence everything, like it or not.
We would have loved to send DD to a good comprehensive with her neighbourhood friends. But where we live a a "good comprehensive" seems to be an oxymoron. By the end of yr6 she was correcting her teacher's arithmetic and grammar. Over the past 2 years, it's become clear that she is very bright, and that's great. We want an environment where that is normal and she doesn't become bored, disengaged and arsey. So we've dove in.
Time will tell.