But indeed manipulation like this can happen because they are the ones who own and know the condition of the casino machines. And they are also the provider, so they certainly understand and have their own way to always get more money from the users, right? As long as it's still reasonable, maybe it's considered normal, especially if users still have chances to win. Unless there wasn't even a chance of winning, it would definitely be suspicious. Only certain manipulations are possible to some degree of victory. Yes, we don't know for sure, but it's possible it could happen.
Manipulation is natural, people improvise when it is necessary but I think reputed Casino wouldn't want to indulge in this, not that some Casinos wouldn't do it but it wouldn't be all because playing consistently in a casino without any wins will trigger an alert for players that there is indeed something wrong with where they are playing and if players find out about such corruption, they wouldn't come back.
You know the funny thing is that many people are betting on the likes of lotteries with huge jackpots because they are hoping that it could change their fortune in life. Lottery bettors must be aware that their chances of winning the jackpot is one in several millions but it doesn't discourage them. That one in several millions will win is enough for them to continue betting because that one could be them. And many of these bettors are poor people. They're only relying on luck in gambling as their ultimate savior.
They are poor, too addicted and don't think of alternatives, some of their betting techniques most of the time is based on assumption and it is too far from reality but they will always play it anyways just to cash out huge bags