Apparently there are specific highly-prized things which are in short supply, like Sound Blaster audio cards.

Probably just retro collecting craze driving prices up.

e.g. 10 years ago people were dumping CRT monitors, now a decent Sony Trinitron starts at 150-200 €

In the late 90s a lot of these machines were being abandoned. Properetary Unix was dying due to Linux, and non-intel CPUs were also getting crushed. Plus there was the dotcom crash meaning defunct companies got rid of gear.

In those days I got an extremely cheap Sun workstation on ebay as an example.

Anyway, I guess supply is low but there are still nerdy people who think an old Unix machine is cool. (I'd take one running Irix just to play with for sure.)

I believe they are used in certain models of CT scanner, MRI or some such expensive medical equipment. That probably drives at least some of the demand.

I think it's just low supply. They were quite expensive so not that many existed to begin with, and then the last generation of SGI MIPS machines were largely cleared out by companies and academia in the mid-late 2000s. Anything left for sale now is either from hobbyists, surplus sellers hoping to cash in on the few niche markets that still use these, or just really late clearouts.

I bought my Octane on eBay in 2008 (it was previously used at Ford), I think it was around $80 and shipping was more than half of that (an Octane weighs ~80 lbs).

Here's a crazy one I saw yesterday: the Canadian government auctioning an unused Origin 3400, still in shipping crate. https://www.gcsurplus.ca/mn-eng.cfm?snc=wfsav&sc=enc-bid&scn...

As a teenager growing up in the 90s, SGI machines were the pinnacle of graphical power.

I would love to own an Onyx, even just to look at the case. Just because of what it represented for me as a kid who could barely afford a Voodoo card.

Did it survive past that incident? Those old crts are something else.