First time hearing about this, it's pretty dramatic for me. I grew up in times when computers were off-white and we liked it.
Modding has been a thing for 20+ years though, people spend money for aesthetic purposes only.
I think that says more about you than the ecosystem at large, people been modding computers for decades at this point, hardly new that some people seem to care more about looks than actually features/functionality/specifications :)
Personally I'm with you (but black), my entire desktop is just one color, and if a component is available in RGB and non-RGB and the difference isn't too big, I pay extra for that non-RGB version (which doesn't make sense it's even the case, but here we are).
I guess you could argue that we're all obsessed with the looks, some that all RAM slots are occupied, some that RGB is everywhere, some that the PC case should be off-white and slowly morph into beige, others that everything should be minimally black.
I remember being annoyed that it was hard to get the CDROM burner to match the case if you weren’t standard beige, and when black/clear came out it looked so bad for awhile!