I realized recently, as I was thinking about the thousands of dollars that I've spent on folders over the past ten years, that all the cutting I've done over the past 30 years with a folder could just as easily have been performed with the Buck 110 I got when I was twelve for $25. And I'm talking about a LOT of cutting.
I'd wager that most knives purchased by people on this forum are more about desire and less about need. After all, how many folding knives does a person really need? How many folders can a person actually wear out in a lifetime. I'm guilty of this myself. I've bought knives just to buy them, not because I needed them but because I thought there was something cool about them, and because they were different from what I already had.
I compare that old Buck 110 to my current EDC, a Bradley Alias. Sure the Bradley is lighter, but the 110 isn't exactly like carrying around a cinder block. The Bradley has a pocket clip, but the leather sheath that came with the 110 works just fine (in fact, I've almost lost the Bradley when the clip got snagged on packing straps, that's never happened with the 110). The Bradley is easier to open and close one-handed, but I've never been in a life or death situation where I needed a one-handed folder.
Like I said, I think it's often more about desire than actual need. But there's nothing wrong with that either. It keeps the knife companies in business.