I mostly use my knives to trim my nails and cut fruit at lunch. The fact that I don't use my knives for anything hard, or even every day, doesn't bother me. They're something that can be appreciated for their history, design, aesthetic appeal, how they feel in your hand, and for someone interested in steel metallurgy it's neat to have a little piece of finely made steel in my pocket. Tools are inherently interesting and valuable to me even beyond their utility as tools. What can I say, I'm a human, proclivity towards carrying tools made us what we are today, and even if it's nearly vestigial at this point a lot of the time I still embrace it.
A $1.30 mechanical pencil might use the same lead and accomplish the same goals as any other pencil from a utilitarian perspective, but I still enjoy using my Alvin Draft/Matic, even if it's just jotting down a quick note. It's a neat piece of engineering and has visual and tactile appeal, even if I never had to write a single thing I'd probably still enjoy looking and fiddling with it, sometimes carrying it around just to engage my sense of touch while walking from one place to another. Same goes for a nice knife in my pocket with jigged bone or smooth bone, or a knife that I can flick open with my thumb or finger just to immediately close it again without even thinking about cutting anything.