As noted by fozziedoggie, the property has a limited number of rooms. If you look at the thread for the property you will see that others have been able to book reward rooms but usually only when they first come available or by watching like a hawk for other times. By searching for one night, I currently see King Superior rooms available for reward bookings (95,000) from the 21MAY2018 - 29MAY2018 and May 15 - 16, 2018. I did not search other dates.