Just imagine the crowd of sycophants and scammers that surround these people, all trying to collect some little bit of the money that sheds off them like dandruff. That crowd is going to treat any voice-of-reason follower as a barrier to wealth and an enemy and work very hard to get rid of them. It’s got to be incredibly difficult for billionaires to access any kind of negative feedback or reality check, and spinning out into one’s own little fantasy world seems like an inevitable consequence, even if they start out ‘normal.’