I have been watching your auction and am really surprised no one has bid on it yet. I think your price is very fair and would think you will still get some bids on it before it closes. Unfortunately, you are listing a heavy gas-guzzler at a bad time in our economy for such things, but there are still people very interested in the classic motorhomes and would hopefully buy them now, when prices are lower.
The problem with the older mohos is that a lot of things will need to be renovated/replaced (unless they already have been). All of the window seals, possibly/probably major electrical components, steering components, plumbing, etc. Certain parts can be very expensive (windshields, aluminum panels, etc.). We put several thousand dollars into our 1984 310 Limited almost immediately after buying it in similar condition, just to make it road- and camp-worthy.
There are people looking for these beauties out there, though. Try posting it in the Classifieds section here on the forums, if you have not already. Don't give up! The right person is out there!