Back then there were few entertainments. No electronic games, no television, and no means to communicate other than face to face and hand written letters. Gambling was one of the common past times among the aristocrats. It was also like a FICO score. The amount you were willing to risk was an indication of wealth, status, rank, and class. Dice and cards were very popular, but for those brave or foolish, there were feats of daring. When playing cards or dice, you controlled your own stakes, but in these feats of daring, someone else held the stakes of bettors. They also had the responsibility of delivering the pot to the winner of the bet. So stake-holder became the term used to describe them. For the full history read the book or take the course.