So then based on your definition, the functionality of a blade is directly related to the income level of the user? If, say $19,000 was as meaningless to you as pocket change, would a Loveless then be functional? To me, functionality is something that is inherent in the piece. Can it do what it was designed to do?
Perhaps a quality like usability is more what you are talking about. The designer of a knife may use it every day according to its functionality; whereas, someone who pays $19,000 for the same knife may never use it at all.
Anyway, I think I see what you are getting at. Five years ago I never would have dreamed of paying over $300 for a pocketknife, and I would hesitate to use my Emerson/Benchmade collaboration which I paid $96 for. Back then, a Sebenza was useless to me as I would be afraid of damaging it. Today, my Sebenza is my EDC. Not only did I pay close to $350 for it, I use it everyday. It fulfills its functional role perfectly, and as far as usability goes, well like I said it's my EDC.
Now, would I ever use a $19,000 Loveless? Not until I make $19 million a year! Still very functional, but totally useless to me right now.
-Al-