Players will play in those casinos where it is profitable and comfortable for them to play. If it is not profitable to play in a casino and a player loses a lot in it, he will leave the casino and vice versa will prefer to play in the casino where it is more profitable, but less comfortable.
Any casino is created primarily to earn money for yourself. While some players earn money, others lose their money and in order for some players to earn a lot, others have to lose a lot.