I am also in NJ and while I often carry a modern, I will always have a traditional on me (Normally a sodbuster, sak, or opinel).
The one thing that quite a few people don't think of, is if someone carries a quality (for arguments sake, $50+), they wil likely be "knife person" or it was gifted by one.
Given that, it may also be the case that a traditional might be carried for food or use around skittish people.
While I will concede that more carry modern folders, I don't think traditionals are as few and far between as we may think. Mostly because they aren't readily noticed (mine stands upright next to my wallet).
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All of that said, I don't often see knives as a whole, aside from some tradesmen who carry lower end moderns and the errant GC who carry trappers or tl29s.