You are right with most parts of your comment, specially with what you said in the end, which is that, our own actions lead us to poverty and bankruptcy, I love this statement to be honest, because in the end of the day, there are people who gamble, return home and continue their normal life, and may never return to gamble again until further notices, usually several weeks later. While there are other people who almost sleep and wake up in a casino house each and everyday - our actions indeed is what either lead us to becoming rich, becoming poor and rekt for life..
And let me also use this opportunity to let you know that it's actually possible to win huge from gambling, I would be doubting like you if I have not witness3d or seen someone who won over $100,000 from a lottery here in my country.
Winning good amount of money is very possible in gambling, but then, it solely depends on individual luck, and it's also possible that there are many who may likely gamble for several years and never win any amount of money that is significant.
For gambling that is done in moderation, when we have got the results, we should be able to stop gambling and return home to continue our real life, whether the final result is a win or a loss, but we must be able to think that gambling is just entertainment, it is very lucky if the results can make us win and if the results are disappointing, then we should not take it seriously like not accepting the defeat, that is the wrong behavior.
I agree with what you said, indeed this luck is not something that can predict it accurately, so it is not strange if there are people who have been gambling for a long time but have never won big and of course that is because luck is not on their side. In my own environment, I have not found anyone who can get a big win to the point of drastically changing their life, or maybe there is but I myself do not know.