Think of the cash rooms listed by DVC in 3 categories.
A. Rooms DVC books with the developer points that DVD is required to own (typically 2 to 4% of the total points.)
B. Rooms DVC books due to needing cash for member exchanges (cruises, adventures by Disney, ect.) that member book with points that are not directly controlled by DVC.
C. Breakage rooms, which I think Sandi did a good job explaining when and how they occur. Of income generated via breakage, up to 2.5% of the operating budget of the resort is revenue for DVC, which in turn reduces dues for members. Any income beyond that is kept by Disney, I don't know whether it's by DVD or a different division. I haven't paid attention since Covid, but prior there was never a case where breakage income didn't exceed the cap (and they have never revealed data by how much.) Theoretically, there's no cap on the number of rooms they can take for breakage, but in practice it hasnt been too egregious.
It didn't used to be a problem to ask about breakage availability, and as I mentioned I've been able to book those rooms in the past, but it's been a while, and it wouldn't be the first policy DVC has changed over the years. Anything not explicit in the contract is not guaranteed. (A good point for new members to remember regarding decor,
point charts, non-listed amenities, member perks ect.)