I've been doing it for years. To think that a handful of wealthy families can control the global supply of money is silly at best, lunacy at worst. It's too vast, too decentralized, while totally interdependent and entirely unpredictable to be effectively controlled by a small group of people.
If the theory held true, there's no way that the venerable House of Barings would be brought down by a lone idiot who hid a few wayward trades. And that's just a little example.
This is not to say that the very powerful can, and do, exercise more influence than an ordinary participant. Dick Cheney has more effect on the weather machine than they do on the global financial system