Millions of people head onto the casino floor each day in search of excitement, camaraderie and the opportunity to earn a fortune. Many fall short in their quest to seize a profit, but there have been some remarkable stories of players cleaning out casinos over the years. These are five of the most fascinating stories from the casino floor: Elmer Sherwin Cashes in at The Mirage World War II veteran Elmer Sherwin was among the first customers when The Mirage flung open its doors in 1989. The 76-year-old retiree was travelling around the US in a mobile home with his…