Statistically or qualitatively?
In all seriousness though, I have no aspirations of living the elite-NYC-preschool lifestyle. That being said, life is about tradeoffs and while some of the expenses might seem patently absurd, others seem like things that anyone might reasonably want for their children: to play sports, go to summer camp, to be able to get a chemistry tutor if they needed one, etc.
That's not to say that all of these expenses are necessary or that your kids can't have just as good of a childhood without them, but at some level enough of these expenses do have merit that there is a tradeoff.