I don't but it sound like he is used to it or it is his defense mechanism that's why he is saying that. but it is not good to lose that much, it is not normal and cannot be tolerated because from what I am seeing yes he is on the way to become an addict. He needs to seek and advice and he needs to learn to manage his expenses and those money he is betting to gambling. Not because we have much to spend we can freely spend and lose to gambling because we have more money to spend.
If he realizes what it means to be an addict, he will immediately seek advice from those closest to him because using a lot of money like that shows that he seems to lack good self-control in gambling. Or he really wants to show that he can play gambling using big money. But it's true that having a lot of money doesn't mean we can spend it once, even if it's his weekly earnings and he can make even more money.