It seems that someone has started to imitate your unique sharpening idea.
It's hard for me to tell from that image. There are serious scratches in the spin rocker area. I couldn't produce scratches that bad with the tools I use even if the blade wasn't lubricated. Can you think of a way to do that even with a powered sharpening machine?
Now that I look at it, though the angle is wrong, I'm not sure there is a hollow in that part of the blade. Like these blades were seriously abused.
Maybe that area was already made that way in the factory blade - or the person does a lot of jumps, to create that effect, possibly on dirty ice, or fake (synthetic) ice?
The spin rocker was also done very unevenly across the width of the blade. Again, I couldn't do that with my tools. I think it would be pretty hard to do that with powered skate sharpening tools too - wouldn't it? Unless you got rid of the table, and hand held the skate so the blade wasn't close to level? I'm not sure what was used. Maybe another type of tool, that was held at the wrong angle?
Or - are there machines where the cross grinding wheel has no table below it, so the tech might hand-hold the skate without a table to guide them, and not bother with the finishing wheel?
Can you figure out how that effect was produced?
There are some pretty bad scratches on the rest of the hollow too, and they go full length, from what I can see. Like they skate a lot on dirty ice, possibly outdoors, though I could be wrong - I've never seen skates that were only sharpened with a very coarse wheel. Maybe they look a little like that.. But I wonder if the entire effect, including the scratched and messed up spin rocker, was just created by skating on dirty ice. Or fake (synthetic) ice?
I'm quite whether this skater does in fact skate on dirty outdoor ice or synthetic ice? Could you ask, next time you see them?
Can you think of another way such a strange pattern of scratches and off-axis metal removal could occur?
Actually, I can think of one. People sharpening rental skates sometimes use a "rental wheel" - an extremely coarse wheel that lets them sharpen the skates in one pass, which they typically do in 20 - 30 seconds. They sometimes hand-hold the skate, not really resting the blade on a table, and quickly move it across. It's remarkable how little time they spend on those blades. And remarkable how bad the resulting edge shape can be. I've seen people try to skate on rental blades that I would have had trouble staying upright on.
But surely, no professional skate tech would do that on anything but rental skates - would they?
And someone sure didn't take much care to avoid rust. Rust has a tendency to spread, and become worse. If I received blades like that, I would probably remove enough metal to get rid of the rust spots, lest that happen. If you can't successfully encourage the skater to take better care to avoid rust, maybe you should suggest stainless steel blades - but even they require some care, that it looks like these aren't receiving. And I admit all the decent stainless blades I know of are expensive - maybe too expensive to waste on dirty ice? Would it help to give the skater a special "gift" - like a rag, to wipe the skates dry?
I guess people who sharpen for others see some examples of remarkably poorly cared for skates, like auto mechanics do on cars. Do you see a lot of skates that were taken care of that badly?