People are probably afraid about how they're going to transport and install the thing.
That or people are just cheap. Is this an ad in the paper, an Ebay thing, or a garage sale thing? People at garage sales are CHEAP!!! The price is marked on the item, and usually you get a (in broken English, no less) "Fie Dolla?" Look pal, if I wanted to sell you that boom-box for FIVE DOLLARS, I'd have put $5 on the freaking tag! See where it says THIRTY FIVE dollars?? Now go away.
Anyhow, back to your situation, I feel that people will never pay anything near the retail price for used items, especially items that society deems as repulsive: "Honey, you bought a USED BED today??? That's disgusting!!!"
You may have to just see what you can get for that thing, and hope for the best (just don't sell it for fie dolla)