I am seeing cash +points option for 24/4-27/4, but not on 23/4. I would guess they are simply sold out. I checked a handful of dates throughout the summer and it was the same, no gold points rooms. However, there is a standard award room open on 1/8-2/8. On that date, the points + cash option is significantly cheaper than on the dates of 24/4-27/4. I also note that a classic room is available on 1/8, but not on any of your dates in April.