But this just assumes that everyone is striving to get into 0.1% equally, where it might make more sense assuming that someone who goes to Wall Street wants to

But this just assumes that everyone is striving to get into 0.1% equally, where it might make more sense assuming that someone who goes to Wall Street wants to get rich more than a nurse. It's like saying it's a lot "easier" being in top physical shape if you exercise at top sport facilities in the country, and/or already come from a family of athletes. Both of which are already signals you might be trying very hard in the first place. Coming from rich families might also mean being rich and making money is more socially valued. And rich families don't posses only money and connections which makes it easier, they probably also have good knowledge of how to make money and where money can be made compared to working class families. So before jumping to any conclusions on how easy it is and why it is easier exactly, stuff like that needs to be thought through a bit.