You can earn real money in casinos, that's why they do exist. They pay out just often enough for people to believe that they are one pull away from hitting a jackpot.
If they never paid out, people would never go and the casinos would not exist
I recently saw a good video[1] covering the history and appeal of gambling machines. My takeaway is that the primary reason people play these is not because they think they're going to win money. This especially true of pachinko where "cashing out" is a convoluted process of trading balls for prizes for cash.
> If they never paid out, people would never go and the casinos would not exist
This is self evidently false based on the linked article. Random chance games that have no possibility of ever having a net payout attract tons of players and make a lot of money.
I think the problem is analyzing this with the economic "rational consumer" model of human behavior. Gambling is not rational but extremely popular because people are not rational. The whole industry is a trap that feeds users dopamine rewards in exchange for money. Once you're in, the payouts have little to do with it.
This whole article is about apps that are up-front about never paying out cash. Money turns into points, points can be lost or turn into more points. But points never ever turn back into cash. And yet people play.
If they never paid out, people would never go and the casinos would not exist