There's an old con game - you send 500 letters to gamblers, predicting the next Dodgers game. 250 predict they'll win; 250 say lose. Game happens, 250 people think Hey lucky guess. To those you send 250 letters, 125 predict they'll win the next game; 125 lose. After 6 games you have 8 people who have seen you guess right 6 times in a row. Get them to pay you for another (worthless) letter.