I think people like that always have positive energy whether feigned or real. It's what attracts people (and money) to them. Famous celebrities, high level execs, politicians that I've met all had similar outward charm.
Being on their own, they have their dark moments, too.
Guy Burgess was well known when a British diplomat for protracted alcohol binges accompanied by all sorts of poor decision-making, but he never let slip that he was a Soviet spy.