It's tricky to use developer rental rates as the comparison point, because developer rates are for a different product---one with a very lenient cancellation policy, for example. In effect, the cash CRO rates are higher in part because Disney is accepting the risk of a change in the traveler's plans. In a
DVC rental, the renter must accept that risk instead.
(Of course, that risk can be "sold" by purchasing
trip insurance, but in my experience almost no renters do this.)
There are lots of other differences---market power, corporate backing, etc., all of which play a role in helping Disney command the prices it can. To put it another way: when I consider purchasing a timeshare, I don't use developer rental rates as a comparison point. I use *direct from owner* rates, instead.
(Interestingly, with my opportunity cost assumptions, I have figured the "break-even rental value" of a $75 OKW resale deed at about $10.50 per point.)
What's more, you aren't competing only with CRO, and for that matter you aren't only competing with Disney rooms. There is a price at which the renter will just get a week at one of the Marriotts or Hiltons, instead---they can be rented reliably for $1500 or less for a 2BR week in peak season, while even at $10pp, a 2BR
DVC unit is roughly double that (or more).
Of course, Disney provides some perks that simply can't be replicated by the other resorts in the area. But, everyone puts a "value" on those perks, and there will be a point at which people are not willing to pay in high enough numbers to support a particular price level.