There are only so many ways you can make a knife. The old saying that there is nothing new under the sun or something like that. Any way, I was working on designing a knife last night and it looked like a lot of the other ones I have made. I give a certificate with my knives to the buyers and in some cases, the knife was made "especially for ______". That is to me a custom knife. It is a hand made knife because I made it, it is a sole authorship knife because I am the only one that works on knives with my stamp. My understanding of "custom" is that it was made especially for some one that wanted it different than what was offered. I don't forge up a pile of blades waiting to be customized or have a bunch of knife blanks cut by whatever method ready to grind, heat treat, and handle.
If I were a full time knife maker, the main objective of my business would be to make a living for me and my family. The means of doing that would dictate if I had the money to have "50" of the "skinner" cut out since they have been selling real good. If I had decided that was the way I was going to have to do business, then that is the way that I can make a living. I forge and I like it. It is not the fastest way to make a knife. It is not the cheapest way to make a knife. That is because I have a "day job" and do not depend on my knife making skills.
I know that this isn't an answer to the "custom" made question, but it is a reason that some do it one way and some do it another. If a knife maker has to stop and make the "one of a kind", then that is his option.
A custom made cabinet for a new home; the choices are the type of wood, design, length, highth, wrap around, etc. The custom cabinet is just a customized version of a cabinet. They cost more because they don't get to cut up as large a quantity of parts at a time for them.
What it all boils down to is that if the customer will talk to the maker, company, mid-tech, or whoever is responsible for getting the knives sold, then they will know what they are getting.
Just a thought, if I had Case make me 5000 stockmans with my logo on the handle and using Bois D' Arc wood for handle material, all according to my specifications, would they all be customs? Just because they are all alike, they would not be "one-of-a Kind", but according to the diffinition of "custom" they would fit, or would they???