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
Yes, but still if you you treat it that way, that you think that casinos wants to be friends with you, then that is already a trap. And for sure the free hotels if you take it, obviously you have to play on their floors and so it's not free at you think it is.
So there is no secret for this casinos on how they uses psychology and smart gamblers know that. But for the majority, we are all uninformed until we have this kind of thread to point that us to us. However, there are not control on our side, as we still fall for that very old trick by the casinos.