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Sometimes from some of these games, if you believe that you're never going to win, then you will never ever win. But if you believe that yes, it is possible for you to win, then the chances of you winning become higher automatically based on your belief and mindset.
This is not a matter of wanting or not wanting to win. Even though you want to win, it doesn't mean you will win since winning 'is all about luck. Looking at the image above it doesn't looks like you are going to win if you wish but you will win base on luck. And this luck happens when you hit the target.
You're right I think @ Rruchi man is getting it wrong, for him to say that it depends on ones believe looks like there is a guarantee about the outcome, but looking at it the other way round I think he's right. surely if you believe that you will win while gambling your chance of winning will always increase that is because you will be extremely careful while making selections/ predictions, you won't bet on random games as you used to. And sure going about it this way would increase your chance of winning, but that doesn't mean that the wining will come that very moment it might come the next day or maybe when you don't even expect.