Do B&M rooms generate any kind of substantial profit for the casinos??

[teddyFBI]

Elementary question, I suppose, but I've been trying to work through the numbers, and can't imagine that the B&M casinos really make any kind of substantial profit from the minimal amount they take in from rake. Is it simply that they want to attract more guests who will then stay in their rooms, eat in their restaurants, and lose their money at their other games?? Because a poker room, by itself, I can't imagine being all that profitable...