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I think your going to find yourself to be in the minority here, I'd be willing to bet most of the people in the traditional forums buy used, right now you're 10% of the people on this thread who won't, actually you're the only one right now, (ain't statistics fun?).
By limiting your self to only unopened knives there's a lot of knives you'll miss out on, a lot of vintage patterns you'll never get exposed to because they're not made anymore, plus your robbing yourself of the joy of trying to imagine what the previous owner used the knife for, what his life was like 70 years ago when the knife was new.
There's a whole bunch of people who love to try and imagine the type of person and what their lives were like back then and of course there's the whole movement around repairing, repurposing and restoring old knives, it's fun to rehandle an old Case or Schrade Stockman or Trapper.
Don't limit yourself to only NOS you're missing out on a whole other aspect of knife collecting if you do.
i'm fine with being the only one. if i came across a knife from the civil war that was being sold for nothing in an antique shop, i'd grab it but thats a whole different story. i really dont care to imagine what someone else was using the knife for 20 or 30 years ago. my fathers old timer i will proudly inherit and cherish but we're talking family.