I'm going to take a stab at this in the hope that Doc or Caskbill, or someone, will correct any inaccuracies.
There are two separate inventories of points -- one owned by DVC owners (about 95% of the points at a given resort) and an inventory of points owned by DVD (roughly 4-5% of a given resort).
DVD rents out most of their points...for money...it's the American Way!
Any excess DVC member points inventory not used at 60 days out becomes "breakage." That availability is rented out by DVC, and the resulting revenue is "breakage income."
Breakage income does not line the pockets of the voracious Mouse. It goes to defray operating expenses of the resort, thereby reducing our annual dues.
In very heavy times, like Christmas, etc,
all point availability is gone by the time the 7-month window opens up. So there is no transfer of availability from long-suffering DVC owners to the voracious Mouse. It's all gone.
It's complicated, but unscrupulous renting procedures can overload a resort for a specific period of time. If it's a small resort, and a very busy time, the effect is magnified.
As a result, Lasrnw ends up on the outside looking in...even though -- no strike that -- BECAUSE they are a DVC owner. That ain't right.