What is considered "High end" will change with the evolution of your interests (finding that you gravitate toward knives that just cost more), your buying power (how much you can spend), and inflation (10 years ago a mid-level knife was found in better than average steel, made by a main brand stateside or in Japan, and could cost around $75...that's generally no longer the case).
There was a time when spending over $50 on a folder seemed impossible to me. I remember practically emptying my checking account to buy my first Cold Steel Trailmaster for around $140 back in the early 2000s. Even still, as my tastes changed, it wasn't until about 5 years ago that I broke over $200 on a ZT and only in the last year that I have decided that most pocket knives that I honestly want will cost me over $400 and usually closer to $500.
It's not a knife snobbery thing. Its the simple fact that in 30 years of collecting I have accumulated enough lower end knives to use, enjoy, and think fondly of. I am now drawn toward extreme fit and finish tolerances like Chris Reeve knives as well as boutique type knives like double action automatics. These just cost more if I want them.
Even still, "high end" is a relative term. My father carries a work knife everyday and owns the majority share of our successful construction business and can afford to buy whatever blade he wants. I dont think he has bought a knife in 30 years. I just keep buying him $30 Buck 110s for his birthday/fathers day because that is what he likes and will use. He would appreciate a $500 knife for being $500 amd being well built but has no real frame of reference other than he knows that a Buck 110 will easily take an edge, a beating, and once upon a time he would buy the Craftsman version so that he could take it back to Sears to swap it out when he snapped the tip off. You can't get that with a $500 knife.
Likewise, there are guys on here that EDC custom folders costing over $4000. They are made by masters of the industry that I have never even heard of simply because they are so far above the circles I run in I am never going to be able to afford to be in there customer base.
In short, High End is what you make of it. I would be willing to wager that if you ever find yourself stumbling into high end, it will be because you have stuck around the hobby long enough to learn what you like just tends to cost more rather than just wanting to spend more because you can. Just in enjoy the hobby and buy what you like

There is no wrong way to do this
