Maybe you can add to it as what are you think we keep on coming back as if we are under the spell of this big casinos?
Attempts to detain the gambler with gifts is an effective technique from the casino. They are constantly trying to become more than just a partner for the gambler, trying to get into a more personal sphere. In other words - trying to become friends.
You said that they paid for the hotel - is this not a gesture of a good friend, which the casino is trying to seem like? And this works great on those who are lonely. It's a pity that the casino itself does not seek friendship, but only benefit from the gambler