Unfortunately, I think a lot of people panicked after the DV promo and pre-booked hoping to just add FD to their reservation. Unfortunately that booked all the rooms, leaving no availability at several resorts.
They don't actually open more rooms, they have an allotment of rooms for DV and an allotment of rooms for GP but if the rooms are all booked, there is no allotment to give. (using hypothetical #'s) EX: resort has 80% availability, they allot a total of 50% of the rooms to FD: 25% of that availability is allotted for DV and 25% allotted for GP. DV books and uses their 25% allotment..........then everyone else comes in and pre-books "hoping" to just add the FD to their room reservation but all they have done is book the resort to capacity leaving no allotment at all to the GP offer.
These are just my thoughts and are not a reflection of anyone else.
I may be totally wrong but I do know that CSR had rooms available in most categories for most dates last week and as of yesterday, CSR was almost totally booked for most dates.