In the following video from The Motley Fool's "Ask a Fool" series, our senior advisor to the Fool's Rule Your Retirement service, Robert Brokamp, takes a question from a Fool reader, who asks, "If stock websites are so good at investing, why do they need to charge people for information? They'd make more money by sharing information that will create more buyers for a held stock, so the price goes up. Seems like most sites that ask for money are scams."