Even when it's free it's not free.

In order to get it you have to stay onsite, and unless you got a
AAA discount or some other limited offer, you're paying rack rate. And of course next year, you'll have to pay your own tip and if you want a bowl of soup or a salad with your entree (or bread with your meal at Mama Melrose), you'll be paying even more.
I know that's not what the OP was asking, but that's the way the question struck me when I read it.