The world's best-known hamburger chain isn't a top-of-mind name to most investors on the hunt for a big winner. Should it be?There's no denying McDonald's (MCD -0.02%) is the premier name of the fast-food industry. Not only is it the business's biggest hamburger chain (as measured by the number of locales and revenue), but its operation has become the gold standard for how the restaurant franchise business should be managed. That's why McDonald's stock is such a reliable winner.But a millionaire maker? That ...