For a room comp?

For poker its extremely hard. You would have to win a big tourney. Than they would comp your room anticipating you gambling your winnings away. The casino doesn't really rake much (make too much money) off poker. You either got to win a lot of the casinos money or sometimes if you lose enough of your own money they will comp you. My friend lost 800 in craps. They comped him a free breakfast.

They only comp your room cause they anticipating you losing money to them or you spending more money.

Also note room availability. If there fully booked or close to it there not comping you a room unless you a celeb.