Having a knife comes in handy here and there but--let's be honest with ourselves--99% of us who carry fancy knives around do so because they're cool, not because we need them that much.
I can't speak for others Dag, but this is pretty much me to a "T." Yup, I like collecting neat knives, always get a little rush of excitement when a new one comes in the mail, always will, even if it mostly opens little bags of coffee.
Best,
Heekma