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Velocio
My cynical side says they sell it because they can. A jet that size with around 100kg thrust doesn’t have much practical use. It’s not big enough for a jet kart and it’s way too big for any model. Cost is probably around €10k. So what do you do with it?
Back in the late 90s / early 00s I used to build model jets. There was the pulse-jets forum and we used to build the most ridiculous pulsejets and turbines out of old turbochargers just because we could, and generally we just used to run them on the bench. Commercial turbines were available and there were people on the internet who had them, but why would would you splash out thousands on something that realistically will just sit on a bench and make a lot of noise? Of course, with people on YouTube throwing loads of Patreon money at videos now, these sorts of engines get bought and turned into money-making videos.
Here’s a guy off the old pulse-jets forum still doing it the old way (he didn’t have the huge white beard back then though):
https://youtu.be/gAKekhmTRaY