I was making crazy money in the dot-com boom and bought a SGI 540 in 1999 (with an SGI monitor).
With money to burn SGI was a childhood brand, legends in 3D. Such wonderful memories. 15k on a desktop setup - it was loose change, however it shows how clueless I was back then. However I'd felt like I'd "arrived".
SGI with Windows NT - lol - I wrote my first OpenGL game in Visual Basic... I've always been somewhat of an outlier ;-) God help me.
The point? My personal experience says something about the strength of the SGI brand - even in the face of what was happening at the time (3DFX and so on - my previous company was one of the few 3DFX api devs - illustrating how clueless I was...)... it all happened so quickly... I'm not surprised SGI couldn't respond - or more importantly understand the strength of Microsoft/OpenGL/DirectX in the boiling pot of 3DFX / Nvidia and the rest... From memory it took three years and SGI was done - shared memory architecture? No longer worth the cost. :-(
Looking back, I was such a kid - a complete fool.
Greybeard advice: bet on the monopoly. Be smart. Brands like SGI are nothing in the face of install base. Think about how crazy it was to spend 15k on a desktop SGI back then... nostalgia is insanity, vanity.