Yep. It's basically noblesse oblige. At that level and stage of life, the main driver is legacy building ("will I be in the history books").

If someone wanted to live hedonically, you don't need to be a billionaire - a $15-20M net worth would be more than enough.

Those who make the jump from VHNWI to UHNWI have a whole different mindset and viciousness.

JB's philanthropy tends to target Duke and Northwestern (his alma mater).