Usually, when something doesn't sell it's because the asking price is too high.
I sold an orphan October 2008 and had to take much less than my original asking price. I set my original asking price slightly lower than others I saw on Craig's list. I got no serious inquires from either Craig's list or AutoTrader at that price. Surprisingly, I was able to sell the car at a car dealer's auction for about $600 less than my out the door price. The market has softened a whole lot since then.
A couple weeks ago I took delivery of the car I reserved. Having the orphan for a couple months really clarified how I wanted to configure the smart. I feel it was worth $600 to find this out.