Actually, if most of the people win in their every gambling then yes there wouldn't be any poor people in the world But here I will say the another think and that is If most of the people win there every gambling or bet then there will be no casino in the world because every casino will gonna be bankrupt if the Gambler win every gambling of them.
And that is why we have to accept this hard reality That in gambling most of the people we do gambling will always face losses and because of this we should also keep our gambling fund with the minimum amount what we can a afford to lose.
True, if everyone could win, then all the casinos would go bankrupt, but we see a completely different picture, the casinos are getting bigger and bigger, and this meant that this is a very profitable business for them, but for players, this is most often a place where they lose money. Therefore, do not play for big money, play only for the money you can afford to lose, because most often this is exactly what will happen. And to avoid stress, you can find a hobby, some kind of part-time job, and do what you like.
As we can see there are more and more casino house being open both online and land base operations, meaning that it's the operators that earning compared to those gamblers who can manage to win, though it's not a surprise that there are lukcy gamblers who can takeaway some portions of those earnings, but the numbers are far smaller than those who lose their money from the day to day sessions.
And like what you said, if you want to have lesser to no stress better to use allocated amount and don't be dominated by your emotions.