Casinos win because they have an advantage over gamblers. All over the world. There is such a thing called "gamblers ruin". You sit at a table for a period of time and it will set in. That is why casinos want you to stay longer. If you do, you don't stand a chance. Mathematicians will tell you the only way to have an even chance of beating a casino is to walk in, put down the amount you want to win and win or lose, you walk away. Win the amount, keep the money in your pocket and the casino won't take it back. Lose the amount, take it on the chin and walk away without losing anymore.
Of course, no one will think it is logical to do that. That is why casinos never go bust.
if you win don't quit...
quit only if that joker is replaced with another joker.