Meet George Papadopoulos. By day he’s a certified public accountant and financial planner. At night, he uses the same analytical skills for his hobby: cashing in big-time on travel rewards. Recently he took his family of four on an Amtrak trip from Ann Arbor, Michigan, through Chicago, Los Angeles and Seattle in a luxe sleeper car, using Amtrak points. His out-of-pocket costs? Meals and tips. Before that, he went on a Carnival cruise with his wife to the western Caribbean — paid for entirely with rewards points from his Capital One Venture Card. Papadopoulos is hardcore, and he is not [...]