My absolutely non-scientific gut feeling is that if billionaires were not as influential and carried as much weight as they do in media, that we would be able to assess them as mentally disturbed in no way different to Plyushkin's disorder or some strain of sociopathic behaviour.

From a game theory stand point a billionaire won. Carve your name in history, you can choose to influence politics for the good, pour money into hard research problems in Healthcare, Environment, Energy. Go Genghis Khan and have a thousand children. They could do literally anything and yet choose to continue to increase value for shareholders and themselves, it seems illogical.