Why not keep the gears on it, put a few miles on it and see if you like it before you give up on selling it. It's a very unique bike, though not sought after, perhaps your asking too much. If it comes down to it you could put it on ebay.
My point is, if you wanted to sell it before, why would setting it up as a single-speed change that? If it's a bike you like to ride, go for it, conversions are easy, but if not pass it along.