The article states "The excess educational investment [...] that children born into a typical one percenter household receive is equivalent, economically, to a

The article states "The excess educational investment [...] that children born into a typical one percenter household receive is equivalent, economically, to a traditional inheritance of between 5 and 10 million dollars per child": it _does_ cost money to provide this kind of environment. This is why the 1% gives birth to the next 1%, not because they're better than the rest (again, according to the article).