Again, that is a problem with *your date*. That does not indicate that the inventory is offensive generally. There is a bookable room on your date at the standard rate-- which in cash costs far more than your $450 annual fee. That's like saying a hotel has offensive pricing games if on the single date *you* want to visit it has a high price.

I'm sorry the free night isn't available for the room you want on the date you want. There is no requirement that hotels make an unlimited quantities of rooms available at the standard rate, as I would expect you to be aware.