Gambling as pure joy, without economic rewards, is basically a game. Those exists, where you can even play for free.
But they are not as addictive and fun as the real gambling, because the game itself really is not that amazing, the entertainment comes with the idea that you might win a lot of money.
If you remove the money part, then it quickly loses its appeal.
But yeah, absolutely you should not think that you can make a fixed amount of money gambling, that is just not how it works, I agree.
In gambling, it’s already good if you managed to end up with a profit, but it’s not worth talking about some kind of guaranteed income. This is not a job where you can get guaranteed pay, a lot depends on various factors, from luck to certain knowledge and the ability to manage emotions. I am sure that even if someone manages to earn money here, it is not a stable income, and it all depends on the gaming budget, but 100 dollars a day is a pretty big win and seems unrealistic to me.