It's not a competition, you dont have to try to be richer then other people. There is a point where you have all of the money you could possibly use and give some back to the people maintaining your empire.
Yes, i realize most of these corporations are owned by multiple people. No, I dont care. At the point that the entire company could function perfectly well without you maybe you should consider that, because you have enough money to retire 3 generations of your family.