There are thousands of room nights. But on any given night there are not thousands of rooms. Especially at SSR, Disney foreclosed on a lot of loans in the last 18 months and didn't resell those points yet. They are there rooms, they get to rent them for whatever they can. Just like if I want to rent my points for $6 each, I can.
This isn't going to change. This has been part of the way Disney has done things since the beginning. Back before 9/11 there were fewer specials - since that point the economy really hasn't been in full swing and Disney has a LOT of hotel rooms. I don't suspect that the deals will go away either, Disney - IMHO - has overbuilt hotels and overbuilt
DVC - and they don't appear to be stopping.
So the question to ask yourself now is "is this STILL a good deal for us." And the answer may be no. And I'm not saying this to be mean, we ask ourselves that a lot and keep coming ups with - "well, it isn't a bad deal for us yet." If I lived in the UK and had bought in the late 90s - which means a price around $60 - I'd put my contract up on the resale market. By now, the value of the purchase has come out, you can sell for pretty much what you bought at this point, so your past ten years of vacations would have cost you dues....that's still a good deal. But the value, with the constant UK specials, seems to have diminished, if you bought in the 1990s, you have a short contract life, so the value of the resale is probably going to go down.
Now, a more recent U.S. based SSR owner who bought around $80 - you still have a lot tied up into it - getting out is going to involve taking a loss. In that case, I'd probably still resell, just because you are unhappy and seem to value the bargains.
(For the record, we bought at $63 about ten years ago and at this point feel like our trips are "dues only." Our "is this still a good value" has more to do with Disney as a destination for our family than with DVC itself.)
(I'm an accountant by training, though not by profession, and I tend to be pragmatic and unemotional over things like this. Which is not the norm for people who bought DVC to be "part of the magic" and to "own a little bit of Disney.")