I pretty much agree gambling is for rich people; whether they win big or lose big, they don't have to beg from others. They could feed their family without troubles, unlike poor addicted gamblers. Rich people won't consider gambling as a source of income; they must have other businesses to survive. However, no one can control the luck, so you have to think about it and make a strategy to manage the risk.
If gambling is for the rich, what will be their aim for gambling? To lose part of their wealth or what since they are already rich? Well, you will say they gamble to catch fun, but what fun will they catch from gambling that PS 5 and other video games cannot give them?
Majority of the people that gamble do it to earn passive income. Therefore money is the common denominator which means those with a decent source of income can gamble with their dispensable income. You don't have to be rich, as long as you can meet your basic needs and still have discretionary income, you can gamble and aim to earn more money from that.