I've noticed that, too. I don't know if it means that those people aren't using their "nice" knives, or if they just don't use any knife that much. Unless you're hunting or fishing for meat, regularly building fires from local materials, or actively engaging in bushcrafting because you enjoy it (all the pitch torches in the world don't equal a good headlamp and a piece of fence wire makes a better pot hanger than a willow, but some of us still like to whittle), there really isn't much use for a knife.
I think a lot of people buy knives because they represent adventure and self sufficiency that the owner never really has a need for or ever experiences. They have very little use for the knife, but they enjoy having it. And they enjoy having the next one, and the next one, and the next one, and never mind that none of them really get used.
It's hardly unique to knives. How many people have a dozen sporting arms that they've never put a hundred rounds through...or 4X4's that rarely leave a graded gravel road, or who spend three times as much time making bug-out-bags and survival kits than they actually spend in the bush?
I doubt there's anyone on this forum that doesn't have ten times more knives than they need, and 1/10th as many as they want. But just imagine what a piss-poor selection of knives we'd have to choose from if the only people who bought them were the few that actually put them to hard use.