We're playing because we desire to win some money, but the most important thing once we're playing is to be wise once we win we can stop playing and return tomorrow. Also, maybe if something is going on well that day people might feel more enticed to gamble as they would believe that they have higher chances to win even though that is completely false. It's all literally just in peoples heads. The fake beliefs and fake hopes.
Ya, most times superstition and gambling tends to work together. Many people believing that if their day is right and going fine, so will their gambling wins. For some people, it might work, for others the entire opposite. So, it's still about the money.