And for what it's worth, Disney offers this promotion when it's convenient for THEM, not necessarily for YOU. DVC affords you an opportunity to travel when it's convenient for you (for example, free dining often occurs during the school year, so any parent that doesn't believe in taking their kids out of school for a family vacation is SOL). You can get a discount on an annual pass; Arrange your next vacation to coincide just before it expires and it could save you serious coin (you would still have to buy tickets for each free dining package), plus as others have, the Tables in Wonderland discount that would save you 20% off pretty much every table service restaurant and a smattering of counter service.
I would love to see some additional discounts for DVC members, too. For example, I could be wrong, but I think the Tables in Wonderland is only available for Florida residents and annual passholders. DVC members can only get in TiW if they get an annual pass, which happens to be discounted. It'd be nice for DVC members to be able to get it regardless of the ticket type they get. It'd also be nice to see it usable in more counter service restaurants. Heck, I'd like to see some kind of discounts for DVC members of any kind of theme park ticket, not just annual passes. But hey, while I'm at it, I'd also like a pony. I knew what sort of perks were available when I joined, and I also knew those perks could go away at any time (and the annual pass discount wasn't even a perk when I first joined, though it was shortly thereafter), so I can't complain that as a DVC member they don't ask me "what would you like us to give you for less or free?" All I can do is try to convince them that offering certain perks benefits them in the long run - saving money means I may spend more there, or extend my trip, or pay for park hoppers or water park options, etc.