...
What are we doing wrong?
Got a link to the add??
...never mind. I found it...
Commenting on the ad, not the price......
My opinion......I'm sure it's a very nice unit, but your 1 pic doesn't do it justice.
Give it a good spit and polish, if you haven't already. Take it to a nice location and get some decent pics, inside and out, collapsed and set-up, without all your camping junk. Make sure it's set up properly. All awnings taut, and all poles and ropes even. It's time to be anal. Sorry for being blunt, but you need to present it in its' best light.....
I'd also break the description into bullet points. Easier to read and digest.
Like D4D says, it's a tough market, so you need to stand out.
Good luck with it.