I just bought a $4800 knife and a $8000 knife, full customs from two makers that are regarded as the best of the best, books indefinitely closed ultra-exclusive blah blah. I'll be very blunt about this, it's still very hard for me to accept that I spent that much. I spent a lot of time wondering if they were really worth it. My conclusion involves 2 perspectives: 1. My value, in this case both are were worth it and I get giddy playing with them and taking videos of them, lol, 2. Market value, currently they are both worth it in value wise in the market. I've had multiple offers higher than what I paid by legitimate collectors. If they market value drops, then that perspective changes. I'm a collector so my valuation is based on the rarity and if I enjoy the knife in my collection.
My collection is all over the place recently, I've bought a $1500 knife, then the next day I bought a $150 knife I already have with the intention of modding it myself. I tend to stay in the higher-end range and I'm hitting the point where the value is not justified. For instance, I'm in the books for a Rexford custom but with no solid date. So I want to get a custom before then. Rexford customs start at around $6k for a basic now, the one I want is around $20k. That is a serious amount of money and pretty much my limit. I don't use any of these, they are strictly for my collection. I actually carry a kershaw cryo 2......that is about my limit for a user $30 lol
As far as the price versus value, its based on my collectors perspective. So the rarer, harder to get & gaudiness of it is what I'm after. Prices get exponential in that perspective.