This is a topic I've seen a few times over the years and IIRC more guys are in the use camp than in the keep it NOS camp. I've had some vintage Solingens that I kept as new and couldn't bring myself to use. Still do as a matter of fact. Being able to list a razor as NOS is certainly going to increase whatever value, but if the condition is fine, and the razor is super cool, or one of the 'cult status' razors, than it will still bring a decent buck. IMHO.