Still, the lodging % increases are equivalent across all resorts.
But still more $-wise than any WDW DVC resorts dues increase, right? Even looking at the max $ increase in dues at the DVC's located at WDW, it is MUCH smaller than the equivalent "across the board" $ increase at deluxe (and even mod, I think) resorts.
But lodging is only one aspect of the vacation. But given continuous Disney perk reductions over time with their AP, DDP, etc, Disney keeps on whittling away the value of non-lodging areas, like food, which, by and large is much more expensive / lesser value than off-site. For example the 2008 DDP excludes a tip, which it included in 2007. That's a 18% increase. Yikes! Yes, off-site doesn't have the theming, but I'm a grown-up and I don't need Donald Duck hugging me when I eat my tiramisu.
We drive a car. We have a full kitchen in our 1BR or 2BR.
There are certainly as many opportunites for a DVC member, who wants to realize even MORE value from off site offerings, to eat elsewhere and save some money.
In addition, you have...if you choose to use them or find value in them...the opportunity to take advantage of the Disney perks you find useful. I don't have to do MYW tix...I can do discounted AP's. I don't have to do the DDP...I can pay OOP, or with my AP buy into the DDE. I don't see how DVC lessens your off site options in anything except lodging.
I like the theming, especially at places like AKL. You can't find anything like AKL anywhere else in the US, IMHO. I also like the relative proximity and ease of transportation (both Disney and my own) to the parks. I also like ACCESS to the Disney perks like EMH, 180+10 dining ressies (which is a godsend given the DDP), the different incarnations of the DDP (at times..depends on the trip), and a whole host of others. Were those factors in my decision? Sure, but ultimately it came down to numbers for us. And FOR US they made sense. They might not for everyone.
So locking into DVC prevents DVC'ers from getting potentially very good deals, better values, and sometimes better quality at off-site hotels and restaurants. Many DVC'ers ***must*** do the whole "Disney experience" thing and get a MYW + dining plan. So they stay on property and think they are saving big money with the lodging, but they may not be getting it with food.
Again, how does buying a DVC membership have anything to do with your selection of off site restaurants or food choices? How does it prevent you from "getting good deals" in any category except lodging. Nobody is holding DVC members hostage on property!
On Lodging? Maybe, right now. But if you think that in 20 years, or even 10 years, the comparison will be as favorable, I invite you do do the comparison of the buy in price of DVC back in 1998 vs the lodging costs off site vs that same buy in price back in 1998 vs the lodging costs off site TODAY. Make sure you compare apples to apples, too, in terms of points used for DVC room type vs amenties at "outside lodging type".
You're prepaying for vacations for 50-ish years. You can't JUST compare today vs today. You should make that comparison, but you also have to do some projecting.
Again, DVC might not be right for you. There are TONS of reasons NOT to do DVC...many of them mentioned here. But, if you travel to WDW every year, prefer deluxes (and in maybe mods...I've not done that comparison), and prefer to stay on property....it seems to provide a VERY good value.
As an example, I think Mama Della's at the Portofino is a wonderful Italian restaurant - certainly better than anything I've had at Disney so far, with the exception of Palo's on the cruise, of course.

I wonder what % of DVC'ers have gone to Mama Della's?
I have. But the question isn't "what % of DVC'ers HAVE gone""...it's "what % could choose to go". The answer is 100%, of course. You just need transportation and a reservation.
And personally, I try to plan vacations around conferences, which allow me to write off trip/meals/travel. That's a bargain! "Vacation club dues" are not deductible. Sorry!
Actually, a portion of my vacation club dues ARE tax deductible...the property tax portion.