The wrench knives were meant to grow the knowledge of handmade/custom knives. I had targeted car enthusiast, bikers, mechanics, etc for the bases of that marketing. Decades later, scrubs came out with their thing and they gave it a bump. Like all knives, it depends on the metal the manufacturer uses and how well you are at heat treating.
It doesn't matter if you have the most amazing metal in the world, if you don't know how to heat treat it, then it will always be junk.
I have a patent on the wrench knives and tomahawks, up to the point where I believe Snap-On has their copyrights. I never enforce it, because I think people should be able to make what they want, its still a safe precaution. I am the one that created the snap-on knife design, to an extent. We had a deal going, but that fell through decades ago. The way they got around my copyrights and patents, was putting a blade on a wrench, where mine if one solid piece. lol

I thought that was pretty cleaver of them.
I typically fill 5,000 wrench orders a year, with a whole lot pending still. I've never seen it go below that and most people don't mind waiting, as long as they know they are getting what they ordered. Most of the ones that I get are higher grade tool steel, but I do get my wrenches made especially for me now. As long as I order 20k+ they are pretty happy to make it out of whatever I want.
Same with my railroad spikes, horseshoes, rebar, etc. I have most of that custom made now. Mainly to get the quantity that I need in order to fill all my orders. It also helps that I don't have to worry about the steel anymore. Most wrenches that are of quality will tell what the metal is made out of. From there is it on you as a maker to heat treat it properly.