Elon Musk has made a lot, a LOT of money, notably with the sale of PayPal to Ebay, but that was not his only big score, by any means.
Elon Musk is very, very satisfied with himself. He exudes self satisfaction. Frankly, he is boastful. Enrico strongly disapproves of boastfulness. Enrico thinks the universe disapproves of boastfulness.
But, all that said, Elon Musk has a lot to boast about. All the more credit to him if he can manage to resist the temptation.