I think the price is fair, too, and I've got a slightly different take on the resale value.
There was a lot of excitement around here over the discontinuation, and I think a *lot* of people who were on the fence about the K-1000 bought a pair.
That's what I did. I thought they were fantastic, but was on the fence. They were not cheap and I figured I could always pick up a pair a year down the road. Then they got discontinued, and I started thinking about them seriously. Stock started dwindling, they got scarce, and (like the HF-1 and AKG K-340) I thought that owners would hold them. After several days of deliberation, I bit. No regrets, either.
I think most of the market got satisfied a couple months ago and people like me are skipping past K-1000 listings. Not your fault at all, and I think those are a nice pair. I would have given you $750 for them.
Don't lose hope, either. If you can sit on them until the holidays, sales and prices always go up then. A lot of new headphone owners will pop up here after getting them as gifts in January, and I'll bet that more than a few will get curious about those strange looking cans that are discontinued. You'll sell them, don't worry.