At some point, the point of diversification doesn't hold a lot of value any more. You typically diversify to protect your assets/principal/etc. There's little

At some point, the point of diversification doesn't hold a lot of value any more. You typically diversify to protect your assets/principal/etc. There's little that could happen on the world markets to obliterate Gates' wealth to the point where "diversification" would have had a substantially different impact on him and his family.