> Cost of living must be insanely high in the U.S. For me, these numbers are so high - I can't imagen what someone would do with all this money.

First is secure yourself with fuck you money so you do not need to sell your labor to procure the things you want, especially shelter (land), food, water, energy, healthcare, and education.

Second is play the game against other high earners. Get involved in other businesses or politics, etc.