Well, if you don't use it, sell it. Perhaps you ought to plug it in again and make sure you want to sell it...It is a unique sound that tons of people use. Not for everything mind you, but a tone you may want to keep around...
Well, if your not using it and there's something else you want sell it. Personally I like my VC6 and I can't imagine selling it. There are times when I pick it over more expensive and "better" preamps because I like it's character. If you do decide to launch it send me an email before you go the fleabay route.