It seems these are only sold in Japan. If I understood correctly (using Japanese to English google translate) they cost between 15000 to 19000 yen, debending on the seller. That's roughly 150 -190$.
Having lived in Japan for a while while in the Air Force, I can tell you there is no limit to utterly inexplicable stuff they can come up with. None. Don't try to understand or explain it, you will hurt your brain.
They have to make what people want to buy in order to justify making the DE razors and blades for the niche market folks like us
I hope they are successful enough to stay in the DE business and maybe expend into the injector razor business. Imagine Feather blades in your injector razor...