^
Usually sports fans bet on their favorite team and watch the live broadcast somewhere in a bar with friends who are the same fans. They do it not so much to earn money as to entertain themselves and they bet among themselves without any service. So I don't think they'll choose to play cards.
Sometimes, I watch this in a cafe around my city and those sports fan comes to that place while the other sports fan will also come. Sometimes, they do online bets because I hear them say about one site or even by challenging the other friends and giving the money to the neutral person who does not support any teams. Yes, I see that is because of having fun and not chasing the win. If they lose, they will accept it and not feel sad because they enjoy watching the game with their friends.