Dean is making an excellent point -- and one that isn't obvious on the surface.
DVC, as management entity, makes a continuing profit, year after year -- but only in the form of the management fee, which is a component of our annual dues. Of course, initially Disney Vacation Development (DVD) makes a good profit by selling the leaseholds at prices substantially in excess of construction costs. Nothing wrong with that. That's the business model by which successful timeshares work.
In a conventional timeshare, such as Marriott Vacation Club (MVCI), the business model is much more obvious. MVCI's development/sales entity sells the timeshares. MVCI's management entity manages the timeshare in the timeshare owners' interest, in exchange for a management fee which is a percentage of the budget. The same is true with DVD and DVC.
Where it gets confusing with Disney Vacation Club is that WDW realizes a lot of ongoing, indirect profits from park admissions, meals, and merchandise purchased by DVC members. It's easy to blur DVC's management role and WDW as a whole, but there really is a distinction.
DVC, as the management entity, has a responsibility to look after the DVC members' interests -- and that includes negotiating the best possible business arrangements with other parts of Disney. The other parts of Disney, such as the theme parks, in turn, have a responsibility to maximize profits -- and one way to this is provide attractive, sales-and-profit-generating discounts and other perks to DVC members. 60,000 DVC families -- who are motivated by value, and most of whom return year after year -- represent a sizable market for Disney.