Indulging in luxury makes a lot of people who come into money uncomfortable, especially if they’re grateful for what they already have. Look at his photos in the article: that is a man who’s both happy and content with his life.
The article doesn’t discuss it, but I doubt he’s keeping it in an Uncle Scrooge money in or, like many banks these days, as pallets of Benjamins. If it’s invested (and most of the appreciation is re-invested) even very conservatively it’s working for the companies and nation-states using it, all the while ensuring he can live in a modest style that makes him comfortable.
