There are a lot of people out there who want the look/feel of the real thing and can save a few bucks by getting a repro and/or don't want to use an original, for fear of damaging it (but they're built like tanks?). Also, in the last few years, the sniper craze has exploded, especially now that the CMP is running the Vintage Sniper matches. Two or three years ago, you would only find a few PU scopes (of any type) on Ebay, for example. Nowadays, there's pages of them and people are buying them.
As for yours; take it out and shoot it! I couldn't just let it hang on the wall (but I shoot all my originals, too. So, I'm biased )