User mentality: I just want to have the keyboard that best fit my typing style and aesthetics preferences.
Collectors mentality: I own the rarest and the most special keyboard on earth, wait, there is another one worth of my collection, I got it, um!, I am OK know, no, no, wait again, look at that other rarity is wow, I have to get it. My wallet cry, my wife is very angry, my closet is full, but who cares that other keyboard is one of a kind specimen, that worth all this pain. Wait no, there is another one... (You got the idea).
Builders mentality: Fill your DIY passion here, software, PCB, cases, new combination of switches, ...
The rest of us: Sometimes I am a user, some others I am a collector, I love to try key cap sets, I love to try switches, I love to...(You got the idea again).
The keyboard historian: Research into all sort of old dark and forgotten places to find the roots of ancient keyboards and to share them with we all mere mortals.
Which one fits you better, and what other geek-hacker's behaviors have you witnessed.
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P.D. Lonely hoarder mindset (added at the request of Sir SpamRay) its definition is still missing, though.