The longer you are in the casino, the higher chances that you lose your money. They make you feel comfortable inside the casino so that you won't think of leaving, that's their strategy.
I have that point. They wan't to eliminate gambler's tress especially when they are losing, by giving a comfortable place to stay they change their minds and instead of being depressed, it change into nothing. The opportunity to give good services to their clients will help to make them known and win the business competition.
That comfort will bring gamblers to a much deeper hole instead of letting the gamblers to go home and rest, with this feeling they'll be more trapped within as casinos wanted to let you feel that you are always important and they're always willing to assist you, casinos wanted to bring competition between how to win customers/gamblers trust.