These CEOs who run huge businesses generally work massive overtime. Their life is their job. They live and breath it. They are unidimensional with not much else going on.
To say they do nothing or live of the labor of others is BS. They work their asses off. But they are filthy rich and there is huge income inequality.
Is a CEO worth 500X the average working? 1000X? Probably not. But they certainly work harder than the average joe in their company, and their skill set, vision, dedication and so on are just as rare as an elite athlete, actor, author, musician, and of course that means they'll make far more because their skill set combined with work ethic (and luck) is rare.