I have multiples of a few, some for collecting purposes and others as spares. For instance, I *love* the Kershaw Groove and bought a second (used) one so I could keep the first one NIB. They are identical. The import Kershaw RJI with black blade and no serrations is one of my favorite EDCs, and I already owned two, but tracked down another when I found out that variation was discontinued. There are a few others I bought duplicates of for similar reasons, but mostly for users rather than safe queens. The ones that I consider true examples of what I like about knives, such as the Groove, are worth owning two (or more) of, even if not of particular cash value.