I think that disclosure is the key issue here. While the two most common and visible types are the ends of the spectrum of hand made knife producers there is a middle. Here's my simple minded take of a spectrum:
- Sole author hand maker.
- Hand maker who included work by others (e.g. engraving).
- Hand maker who uses blades made by another hand maker.
- Hand maker who uses profiled or forged but not ground blanks by another handl maker.
- Hand maker who put handles (and maybe guards) on a factory made blade.
While I don't think that sole authorship is a vital part of knife making there are makers and collectors who do. They miss the Bruce Bumps of the world -- their loss.
While I would probably not buy a knife in the last category, I recently made a few because I had the decent blades with crappy handles lying around and decided to fix the problem. One's now in my common use kitchen rack. Note that I did not post photos of it here, let alone claim it as my own.
I might well buy a knife whose handle and blade were both hand made but by different people. The common Scandinavian practice has already been mentioned but also think of Chuck Burrows excellent collaborations!
What is vital, and should clearly be in the rules for this site is that all of the above
must be clearly and honestly represented to sell on this site. Violation should have penalties.