I would like to see the biographies of those people renouncing their citizenship, my guess is that outside of wealth, they might not be what we would call the cream of the crop, or the kind of people that we might form deep, respectful friendships with.
I know of another expatriate who left because an administrative court effectively confiscated his business via a disgustingly arbitrary ruling. He's now running the same type of business in Costa Rica, and is as nice a guy as you'd care to meet.