A casino can not stop you from winning but their is a way they can manipulate the process and make it hard for players to make profits from them. This has been the misery of gambling no one is telling us. You will be betting and be losing and winning small profit which may be cool to some gamblers, but we are actually losing more money than we are winning from gambling.
If you take your time to listen to the experience from gamblers that have been gambling for years, you will be surprised to hear about how they almost win jackpot which always motivate them to gamble.
If they can can't stop anyone from winning and can can make it look difficult for a player to win as you proclaimed, what can you call such, many gamblers knwos about this, but wouldn't went to discuss it, cause they see as something that casinos can't stop and since these things are not something we know how it is been done by Casinos, discussing without prove wouldn't make any sense.
As for money more than we win, that's the game, it was designed to be like that, which is why people should not see gambling as a source of income, rather see it as something one should entertain himself with, and should be done with what we can afford to lose.