Some people really have high hopes which is why they tend to pursue things even though it seems impossible for other people. A hundred dollar a day is not an easy task if you are not doing a job that pays really well. It won't be impossible but will also be a tough thing to do in gambling if you are not skilled enough and if the luck is not on your side. Personally, I find it not really practical to spend a lot of money just to be able to reach a huge profit that isn't certain to begin with, especially in gambling because it is high risk.
But people have their preferences. If you really want to attain it, then go. Just manage your expectations and do not act impulsively so you won't regret later on. High risk, high reward is what happens in gambling after all. Just don't chase winnings after winnings or losses so you won't get trapped into the cycle.
It's best if they don't have such high targets and accept whatever wins they get. After all, they will find it difficult to win every day, let alone to chase $ 100 every day. It would seem impossible to achieve. Even though there is luck they can get, they cannot hope for that luck because luck cannot come every day.
Hopefully, they know the consequences so if they do, they won't be so eager to try to earn $100 a day. They should use their capital to open a business that can allow them to make a profit. That will prevent them from losing the money they can get from gambling, even though opening a business can also experience losses.
It is a risk that we needed to work on and assess if we are willing to lose our money for the sake of achieving our goals, in the process of winning $100 you are risking $2k and if you don't have the limitations, it is not impossible for you to lose everything, in gambling there's always a big risk with your deposit bankroll.
Without you knowing how to control your emotions and how will you manage to avoid losing everything in the long run, it's something that you must need to prepare before jumping into this venue of business/entertainment.
Risking $2k just to earn $100 from gambling is very difficult, and few can earn it. Of that $2k, he doesn't know how much to lose to get to $100. Not to mention the risk of losing that he can get and we know that the loss can be greater than his capital.
It requires very good self-control because we cannot risk losing huge amounts of money. But if he's willing to try it, that's up to him and let's hope he doesn't lose all his money.