Advising someone with that kind of thinking is pointless, at best he will say that it's none of your business and you should just leave him alone. It's better to let them learn their lesson and then we can give them advice - and it also depends on the person, if the person has a hard temper and is difficult to talk to, we shouldn't say anything to them, until they ask us for advice, because in some cases people like this won't understand until they learn their lesson. But if he wants to be told, especially if he is the closest person to us, then we need to advise him that this thinking is wrong and sooner or later if he continues to gamble with this thinking, then his finances will be destroyed and worse he will be addicted to gambling.