I will also tell you that people do different things for different reason. I don't think their intent was to show the world the amount of Bitcoin in their wallet but to sell themselves to the world as Bitcoin champions and evangelists. In fact most people wouldn't even care to know the amount of Bitcoin they have but would likely question how possible that claim was. Of course, no one can accurately guess the quantity of Bitcoin assets the family holds. But the publicity their decisions and actions are getting them is the real winner.