Hello; I imagine the $300K includes things lots of us did without growing up. I recall going to school in my fathers hand me down clothes which did not fit. few or none family vacations. Regular dental work and the like. No dispute plenty of families do not have the $300K per child even spread over 18 years.When I was young, back about 1962, they claimed it would cost $168,000. My dad was making about $9000
(and I'm sure my parents never had that to spend!)
But kids generally last 70+ years .
The average lifespan of a new Ferrari, Lambo etc is only six months before some wealthy fool blows the engine or wads it up into a crumple zone deLuxe.
Also children tend to cost some beyond 18 years.