Disney offers free dining as a way to increase hotel bookings during slow times of the year. To be eligible, you must book a hotel room at the full cash price (and purchase tickets) rather than using your points to book a room.
Since
DVC is designed to be booked to capacity all year round, they don't offer special incentives to convince members to book rooms using points they already paid for. We're in a "use 'em or lose 'em" scenario when it comes to our points -- that's our incentive!
We also do not get a 30% reduction in point rates when they offer special hotel rate discounts or the "pay for 4 stay for 7" or any of the other discount programs designed to get people to book rooms at WDW during otherwise slow times of the year.