If you are earning from affiliate programs of casinos, then it could be possible that you will make an average of $100 per day.
OP included that he has certain amount of money, that will be used to gamble. Affiliate program is not that easy too, you can go for the option and not earn a lot because you only refer few people, or no one referred no money earned.
But if you are a plain gambler targeting $100 per day, I doubt you could make it. Between a gambler and the house, there is not even a fair equation. The house is always a step ahead. Although there are times when you get lucky and win against the house, in the long run, it will always be the house that prevails.
And, of course, casinos are not a place to make a living. They are more of a place to squander money.
This is true, but I am not doubting that he will lose money, I am certain about it that the total outcome is loss, because he is chasing money with gambling, the outcome will be bad which is the loss that will be great.
Like you said, if he go for affiliate program, he can make money from it, but he needs to refer plenty people and continuingly referring more people before he can use it to make money all the time, but affiliate program is harder than that.