I spent 5+ years as a billionaire's wordsmith, which meant knowing him intimately enough to write in his voice.
I think the thread running through most of them is not a belief in their own basic goodness but rather contempt for everyone else, including and especially their peers. Expressing that contempt with plausible deniability was part of my (usually) unspoken mandate.
Contempt and duper's delight. Those were the last thrills once $$ reached a point of diminishing returns.