At this juncture in his life, Bill Gates is tired with money, he has all the money that he can spend and now he is doing charitable works with it, mind you he spends half of his fortunes just to help others and GOD bless him for that
Nobody gets tired with his money and it is really good that he is spending some of his fortunes for the poor,since he is a technology genius i am sure he has invested or even tried bitcoin as i have seen him talking about bitcoin and its prospects in the past and so you never know what kind of investments he had made in bitcoin so far.