An uncle once told me an odd story. He, his wife, and a group of friends went to Vegas on a mission. They took two hourly slots each, 24 hours, and played one machine. No - don't ask me why, it was just something "fun" to do. They even had other patrons cheering them on! When all players had taken their turn they calculated their winnings. To a hundredths percentage point it matched exactly what the casino said it payed out on slots. It was for the entertainment, not the winnings.