I dont think its that... The nemesis isnt shiney...its just.. stainless steel..simple.
Dont forget that the K100 is 25.5mm in width... too fat.. another reason why its lost popularity.
I think a big reason is the fact that it's chromed. Most of the new popular clones have straight brass, silver-plated, or copper contacts and SS, brass, or copper bodies. Surprisingly the K still hits hard, but most stay away from chromed parts in mechs with so many other options out there. I don't buy any new mechs now with chromed parts and contacts, though I would replace my K101 if something happened to it.