This also boils down to need vs want. I would venture to even say that most of us here all have more than we need anyway. It's the nature of the obsession we have sometimes; be it knives, cars, guns, watches, or pens etc.
That's it in a nutshell. Needs vs wants.
Because the people here are all obsessed knife nuts, they feel the want for the more expensive knife because they rationalize the need for it. The truth is, most of the rest of the world gets by just fine with knives that most here would turn their noses up at. If you have a SAK in a pocket and a mora on the belt, your already ahead of most and well equipped for almost anything that you need to do cutting wise.
But that SAK and mora does not feed the Id or the ego as well as the high dollar knife. And so much of the knife sales are ego driven. I doubt there are many here who even need much knife in their work cubicle day, Walter Mitty fantasies aside.
I've traveled 180 degrees on this course. I used to accumulate high end knives in my younger get days in the belief that I was getting a "better" knife. I had a Barry Wood folder in my pocket and a Randall for belt use. After time, I discovered that both were actually a highly mediocre knife and as over priced as they were over hyped. I now carry a SAK in a pocket.