I've seen people dump more cash on one spin on a roulette table and loose, at least you got something out of it.
Before folks tell you what a dummy you are, maybe we should know what you paid for it in the first place and how much use and/or enjoyment you got out of it.
Then they can tell you about the RV, boat or car they bought and kept for 10 years before it lost 80% in value as it sat unused, or maybe they invested in something "solid" like Lehman Brothers, AIG, Washington Mutual or Bernard L. Madoff Investment securities LLC, stocks...
You bought it, you sold it. Hind sight is always 20/20. As long as you didn't sell it so you could keep the Ford Pinto, for when they make a comeback, you should be OK.