I guess the point is that he doesn't care about the money. I don't think he's purposely denying himself things he could afford but doesn't buy so that he can add another 1000$ to his bank account.
If he didn't care about money then why wouldn't he distribute it to his employees in some sort of profit sharing? Noted he's a philanthropist, but he's also the 3rd richest so he's keeping a hell of a lot of the money. There's nothing noble here, just greed in a different form.
