It’s not only sustainable it’s also highly unadvisable because we will be filled with disappointment like the Op, one thing is that we should always have a source and means of earning and gambling can just be use as mean of trying luck if we can win extra money which can help us grow.

Bonus I see that as one of the annoying way of scamming gamblers we get deceived by the amount that’s giving to us as bonus but the wager that is required to clear off that bonus is one thing that looks like we are just working for the casino, bonuses unless for those who are always lucky enough to clear up the requirement if not I see it as a means of reducing winning chances.