What I always find interesting is when a "generic knife" topic comes up, how many people immediately assume folders. Anyway...
All depends on the feature requirements, but generally it's a matter of value. If you think of your dollars as points that are being put into certain stats of the knife, it can help you mentally break down what you're getting for the money. Certain features are difficult to do cheap, because they're inherently a complicating step. But if you manage to find a product that is a close match to your requirements, with no "points" spent on stuff you don't want or need, and that tool is priced fairly for the materials, features, and labor involved, then it's going to be a good value. Value can be found at any price point. People may say that a thing is worth whatever someone is willing to spend on it, but if someone spends $150 on an MTech (and some people do, apparently--scan eBay's sold items sometime and be amazed at what some real got garbage sells for for unknown reasons) then that guy got a poor value, because that same $150 could have been used to purchase something that was better in every possible respect, OR could have bought a whole bunch of that same knife from a different source (hey--there's no accounting for taste!)
I'm a simple guy. I like knives with efficient geometries in pretty inexpensive steels without a lot of glitz and glam factor, and I don't need the latest and greatest in mechanisms. As such, there are a lot of quality knives in the $4-$50 range (yes, $4 -- not a typo) that are quite good for my needs and preferences, and a surprising number of them are from European or North American makers.
I agree with pretty much everything above. I've arrived at a point where I define "premium" steels as BD1, VG10, BD1N, X50CrMoV15, etc. I value ease of sharpening, toughness and corrosion resistance in most of my applications. Heck, done right, 8Cr can be a fine steel. I'm to the point where I wrinkle my nose even at S30V and S35VN. I'll buy them if the overall package strikes me but unlike the current craze, I see it as a detriment the further up the so-called "premium" steel ladder one goes.
For me, there's really two price categories: 1) Good value for the price, regardless of that price. 2) Splurge cuz I just wanna.
I bought a $30 Dexter Russell nakiri-style knife to see if I like the blade style with the idea being to commission a custom made to my specs. But alas, I'm quite smitten with this $30 wonder. I did a little work on the edges and may thin it out some but this budget blade has pushed that custom build from something that was going to practical (made to my specs) to a splurge purchase now.
My Wusthof Gourmet (budget line) 8" cook's knife at ~$75 is fantastic. It has great ergonomics, excellent design, and for a home cook, the lower HRC is not a big deal. But then I have a $150 Yaxell that I love and bought specifically for certain points I couldn't find all together in any other knife.
My Dragonfly 2 and Manix 2 LW have risen to the top of my knife experimentation and will take quite a lot to knock them out of their spots. I know can be very specific about what I want: Wire clip, ergo's, thin FFG blade, steel I prefer, lock type I actually like, etc.
So, I don't really have a set price that I think triggers the point of diminishing returns as much as I do, does the price overcome whatever shortcomings or specific desires I may be looking for and if so, by how much? I've been dreaming about the upcoming Spyderco Kapara since we got our first glimpse. Even started a thread about it over on the Spydie forum. It is gorgeous and appears highly practical and checks a lot of boxes for me. But... I don't really like the compression lock. So at nearly $200 for a pocket knife, I now must ask myself, is there enough in the rest of the package to overcome the compression lock and to justify the price. Sadly, the little voice in the back of my head keeps whispering no. It keeps telling to buy another kitchen knife and some new sharpening stones I've wanted to play with.
