This isn't strictly true. Berkshire has made large investments in companies (outside their insurance float capital) where they weren't buying 100% ownership. S

This isn't strictly true. Berkshire has made large investments in companies (outside their insurance float capital) where they weren't buying 100% ownership. See their investments in Goldman Sachs, BofA, Pilot Flying J, Nebraska Furniture Mart, and others. Buffett and Berkshire are attractive as an investor because they send a strong confidence signal and because they are known to be extremely hands off.