I suppose that not being anywhere near an established, recognized, or full-time maker and having never done a show and being still in the R&D stage in setting up my shop and working out the models and details of production, and leaning more towards hand-made than custom-made anyway- that I really am an outsider here-but I would offer;
5,000 bucks is steep for any using knife, I would argue just plain steep for a knife, so you're pretty much paying for the privelege of owning a knife that was made by a particular person. I have never understood the idea of collecting stuff for the sake of collection, so it sounds like a bad deal to me. Maybe some dig it.
As for me, the most I'll pay is $200-300, likely I'll never pay $300 again, and I would price my wares accordingly.
As far as how long it takes to make a knife, well I can whip up a traditional navaja in about a day and a half, a day if I really work at it. Of course, that doesn't include the time spent in heat treating since I have to contract out `cause I don't have a furnace.
I supose guys doing art pieces or fancy finishes spend a lot more time at it. I could easily design a navaja that took a week to make, but it'd mostly be for aesthetic reasons.
This particular pattern is well adapted to being made quickly in quantity with minimal tools. I also make no attempt to make every one to the exact same specifications. If it fits and works well, and isn't distorted or deformed in any way, it passes. Modern machinery can produce pieces that are a more exact match for eachother than anything you could ever do by hand on a $60 bench grinder, so why try and make something like a machine would when you can make something like a person would so much faster and cheaper?
If I were to guess at what would be the most annoying question I could ever be asked if/when I ever decide to do a show, it would be;
"Does that come in a chisel ground or tanto-pointed model?"
In fact, that would almost be enough to motivate me to take time out to give the inquirer an object lesson as to why a navaja is built the way it is.