Xenia, I think that people see the world as they are, not as it is...
I think you are right that the world is inherently unfair in some cases, so yes, prettier, cleverer people end up getting better jobs. This is what happens in extremely capitalistic societies.
But I don't subscribe to the view that the making of money is the only measure of success or a successful life. For some people, stepping back from it and looking at your life with a , let's say, more philosophical edge, is possible. This is where the artists, painters, poets, ecologists, environmentalists come from. Not everybody sees themselves as a commodity or a product as you mentioned. [I was quite shocked to hear you describe your daughters as the "end product" of a Habs education].
If I could afford it, I would probably send my child to Habs because I just checked out the website and it looks great, but there really is more to this life than what job you can get, how you look, and how much you earn, or even how clever you are.
Kindness, gentleness and other personality traits can't be measured, and money certainly can't be made from them. I was shocked to hear that some private schools weed out kids with problems. While its true that on educational terms your child will get on better without a "problem child" in their class, what does that teach your child about the world? Absolutely nothing. It teaches them nothing about empathy, tolerance ( I thought the example about the boy who'd been given the job of helping the autistic boy in the school play was perfect).