If you want to see a person full of hope and belief, then gamblers are the perfect example. The hope of winning and the belief to win is found in gambling. Even if you tell them that gambling is risky and the result may come out differently (not in his favor), they refuses to accept it and have 100% belief that they will win at any cost.
This type of belief and commitment is not found in any other walk of life. People doing business or spending money somewhere have doubt and fear that things can do against them, and they may face loss too but the gamblers are so firm in their belief that they never look at the other side of the picture. They want the win, and they 100% know in their subconsciousness that they will win. that is the reason they will never hesitate to put money into gambling.
We are not talking about the result which comes later on, once they gamble. They may lose too but the passion and belief of winning among the gamblers can't be seen anywhere else.
Not really in most cases no. At least for me. Betting money is more like a thrill that I add to simple games so I can enjoy it. I mean, who would actually enjoy a dice rolling around right? (Well, there might be one or two people who enjoy that, but most don't). Plus, blackjack and poker are fun games in of itself really since it's a PVP type of game. Well, I turned to sports gambling nowadays though so can't speak much about it.
While I do believe that having such beliefs is good, I don't think that's the case for gambling. If it was a skill game then maybe. And additionally, such beliefs are actually a thing in a LOT of people, especially in competitive scenes like in sports. Mostly because that's their passion in life, and they put literally every hour of their lives in training.