Try playing chess, try playing some video games against your friends, try playing some word puzzle games that has a few minutes or few seconds timer and you will feel that urgency to win and not to be defeated.
For me, I will just take it easy, because I know in the end, even I won, I got nothing, if I lose, I lost nothing too.
It could be a mental game if I'm known as skillful person on the sport I played, then in the middle game, my friend/opponent is leading. At that time, it would affect my mental and I will try to win the game.
Games like chess are not advisable to be featured on casinos or for gambling because it's strict on levels, they'll never be a way a player whose Elo is 1300 would win against an opponent with an Elo of 2000, unless they'll find a way to match gamers with approximately same Elo, skilled players will always lie about their rating just to win huge money. It happens in tournaments too, they're players who claim to have 700 Elo but did it just to take first position, while in real sense their playing rating is close to 1500.
Well, isn't it same to poker? people need to understand the game and how to play better in order to win. If they only know the game, but not have a high knowledge, they will be beaten by skilled players.