Tangent to the OP topic: What I wish I'd bought more of (and kept in the freezer!).
I wish I'd taken out a loan and bought up multiples of several (many) knives of the past twenty or thirty years.
First off would be any of the Chris Reeve one-piece hollow handled models. Retailed at ~$200. but today they are in the thousands.
In 2002 I bought a Camillus "Cuds Maxx" (at $125) for an active duty Marine. Today they go for over a grand.
Also in that time frame, I bought several EK daggers as gifts, as the company transitioned from the family business to Blackjack. I was getting them for $50 to $75 then. Today, they are in the $500 range.
And if we could go back far enough: Anything from Warenski, Moran or Loveless, among others, would today be priceless in about any condition.
What production knife will become a cult object in twenty years? Will a pre-owned Randall or CRK be worth holding? What about the Zero Tolerance bayonet? (They made one didn't they?) Who among custom makers will achieve mythical sainthood?
So then, the question is: What or who is the buy-it-and-keep-it for our grandchildren? And I mean, keep it shrink-wraped in the never opened box with the receipt. . . . (.and buy ten)?