But I don't know what happens if the first time I play gambling I immediately get a win. Maybe I will think the same as people, that this gambling can really benefit the players.
Well that is what we call risk in gambling, we really don't know what will be the outcome is, it could be based on luck, 50/50 chance or sports betting wherein odd makers put a team or a individual as favorite. Yes, there are a people who win immediately the first time when they enter gambling, maybe though you are not that lucky. Nevertheless, even if you lose the first time, it can still be motivation for others to chase what they have lost and so the cycle begin with either a big win or a small lost.
If you are talking about benefits, then obviously it's the free money and then the excitement that you are going to feel. What we call the adrenaline rush and so others are going to be trap with this first win as they want to repeat the process and that feeling again and again.