J, I can say this - there are some Kershaws in my collection that will always stay NIB. The reasons vary: it might have been from someone special, a gift from a friend of a unique knife or one that never was put into production, the factory "oddity", and knives that only had 14 released in the entire run. I collect because of these gems. Now if you really want to see a collection, check out kershawguy's inventory!
On the other hand, when I find one or three that I REALLY like, I use them...sometimes hard. So multiples are in order to keep me in the blades I like!
Yes, I have some TIZDP Cyclones, along with some SG2 Blurs. I'll use one, and keep the rest pristine purely for what they are: wonderful works of steel, engineering and design. To me, they're like a 68 Corvette convertible big block with 22,000 miles on it...a work of art that performs! And having a bunch of Kershaws is a lot cheaper than having a bunch of Corvettes, and they take up less space!