Photograph by Danny Wilcox Frazier / Redux for TIME Tools of the trade surround John Willoughby on his 2,000-acre (800 hectare) plot outside Grand Island, Neb. If you want to become rich, Jim Rogers, investment whiz, best-selling author and one of Wall Street's towering personalities, has this advice: Become a farmer. Food prices have been high recently. Some have questioned how long that can cont