What makes a knife go up in value?

[Bob Denman]

You're probably gonna get me in more trouble... Thanks!

 

[Zulus]

“What makes a knife go up in value“

Inflation is Number One :^)))

 

[afishhunter]

availability and demand.

BTW, knives as an "investment" are about as bad as classic/antique cars and motorcycles, or Zebco fishing reels.