While casino owner have a chance to become very big, but at the same time can go bankrupt. High risk, high reward.
If I can choose, I will choose to be game owner, it's fine for me to make money in steady way, as long as I can earn, I can invest a lot and grow my money. However game owner has a risk too, if you cheat or your games malfunction, the casino can sue you and you need to pay fine fees.
Indeed, game providers will be more stable in terms of profits, they can also develop more games, so the profits are even greater.
Actually both are equally profitable whether it's the casino owner or the provider, depending on how our own skills.
Because I rarely see a casino go bankrupt unless he steals and closes his own casino.