Actually do a search of completed auctions for GN's. There are a few that go below $9-10K. The ones selling for more are either low mileage or the bidders "didn't have the money". I have seen a few guys on here have to re-list their cars due to non-paying bidders. I check daily to get a pulse on the market as I want to replace my car that was stolen.
If I remember right, this was a gray one. The interior looked like it had a bit of wear showing it had more mileage than they claimed. The wear, being a T and not a GN as well as possibly lieing about the mileage probably scared a few people away, hence the low price.
It looked like a good driver or project though.