I guess he does not realize using that big money and still uses that money to gamble because if he is aware, he will not spend too much money playing gambling. Using too much money as that, of course, gives him a big risk of losing the money, especially in gambling because we do not know when we can win or lose. It is a good lesson for us not to use too big money while we can build a new business that can give us profit in the future.
Don't think so, I am pretty sure that someone who gambles are sober enough to know that the money that they spend on gambling is pretty big and they know that what they're doing is right. If you have the money to lose that much amount, I think it's pretty alright for them to spend it plus it's not like those people who spend money on gambling is always poor.
In the first place, A poor will never gamble with that huge amount of money because it's very hard for them to earn that much money. It's either you are right about the person lose still has a lot of money on his purse or the person is just bet his life savings for a fortune just like what Mansour Bahrami did when he lost all his money at one night on gambling.