gambling give you a sense of adrenaline rush and that is why gambling can be so addictive. This sense of adrenaline rush usually can only be created by extreme sport and is not suitable for a lot of people. However, gambling enable everyone to experience similar experience and that is why some people keep coming back to gamble to experience these rush.
Especially if you are going to get excited every time you are going to bet or play gambling. And for example, you are betting with sports game.
You know the teams that are playing, and you know that TEAM A is more reliable and have chance to win the basketball game.
So for sure you are not going to bet with TEAM B and you have assurance that your money will win as you bet with TEAM A.
And that is why gambling is fun, sometimes you already know who is going to win.