When your hungry and tired and don't really want to attract bad attention or possibly lose a lot of money when all you want to do is sleep.
I personally, only have one casino per city that I have a players card. So when I am tired or hungry, I like to play a break even game or a little more with an flat bet of $50 when the pc's are not looking and $100-150 when they are at two hands at a time and about 3 hours which translate to about 400 hands.
How do other people like to play when they have comps?
Is it better to have more than one card or not. I think not.