Knives are meant to be enjoyed whether they're used or not.
As opposed to the parochial attitude of a lot of BF members, some people collect knives the same way others collect coins or stamps. They collect them for the pure joy of owning them. And who's to say there's anything wrong with that?
In my case, I'm a collector and a user. Whether or not I use a knife depends on a number of factors. I'm not bounded by the restriction some folks impose upon themselves of never being able to buy knives unless they intend to use them. I can actually buy knives simply because I like the way they look or because they embody certain characteristics I'm looking for or because they're made by maker whose work I admire or because they have the potential to increase in value. And as a collector, I actually provide a valuable service to the knife community. When I get tired of owning a knife or when it has appreciated to the point that I'm willing to let it go, I can put it back on the market in pristine condition and give someone else the chance to own it. Oftentimes these knives have long since been discontinued.
I'm not a dealer, but I've sold a number of knives in mint or near mint condition. And this much I can tell you. Regardless of why someone purchased a knife from me, I've never heard a single one of them complain about the fact that I didn't use it before I sold it to them.