It's just their hallucination that they have genius or special qualities, belief in themselves. In fact, systematically or in reality, the opportunities and advantages will be completely controlled by the bookie without looking at the individual's abilities. I think there are many factors that motivate them to gamble, The main one is the easy and quick way to make money, gambling provides an adrenaline rush and entertainment that leaves people feeling challenged and entertained. That's why many gamblers fall prey to their own addiction, fueled by the illusion that they can overcome it.