It's fun reading through to see what folks were carrying 4 + years ago, and how some of them have been discontinued, and therfore are worth a lot more. Maybe there are those that would have regretted not keeping them NIB condition, as the asking price has skyrocketed.
I would not be one of those people, though. I never buy a knife to keep it locked up for investment purposes. I buy what I like, and I use it. I do have several knives under $100, but I also have several between $100-200, and a small number over $200, with just a couple around $500. They all are carried and used. I'm not too averse to actually making them work hard, either.
I buy, again, because I like the knife. The joy comes with the use, and being able to appreciate the form AND function.
A few of my favorite EDCs: Microtech LCC D/A, Microtech Scarab, Kershaw Tyrade, Benchmade 730CFHS, William Henry Gentech, ZT 0550, Kershaw 3600, Spyderco Vallotton Sub-hilt, Case Tony Bose Lanny's Clip, Microtech Tachyon II, GEC SFO trapper (2012 Traditional Forum knife), Camillus Cuda Dominator.