So reading thorough this thread, and looking back at DVC Memberships, there is one thing here that I think y'all are missing.
You are looking at it from the wrong angle. you're looking at "DVC can't make money by offering this perk". But if you look at the perks, Disney execs are looking at it the other way. DVC is an largely untapped resource for them to MAKE money. How?
Senses not booking enough? Offer discounts to DVC members.
DCL not booking? Offer discounts to DVC members
Restaurants having trouble at springs? DVC to the rescue!
Hoop Dee Doo having trouble? 20% off to DVC!
You need to approach this from the opposite side. it's not that Disney feels the need to offer something to DVC members to keep them happy (as we have established they don't). But they also realize that DVC members are inherently Disney fans with purchasing potential that are inclined to visit the parks. the perks are not to decrease profits from those activities, but increase or fill a gap in sales.
Someone said they could see a board room meeting where someone says they don't have to give us anything. Here is a different board room meeting: "How can we increase sales of yellow fluffy bears?" DVC: "Let's offer our members a discount and put heavy advertising on them in the DVC resorts". Visa: "We'll take some of that actions, too. Discounts for visa holders". D23: " Hey... don't hog! We want some!" etc...
Just look at the perks right now and you can see it:
https://dvcmember.disney.go.com/news
Free advertising for Senses and 9 dragons this month. Who wants to bet 9 dragons had a few empty seats going around that with the help of DVC and possible perks thorough other avenues are closing up?