I've long noticed the connection between liking fountain pens and mechanical keyboards, but never noticed the tie to head phones. (I'm sitting here wearing some.)

Maybe the personality trait influencing this is a higher sensitivity to tactile experience. I wonder what other tastes this group might share. Of course, nice notebooks/pads go with the pens. I have an inclination toward boardgames with hefty dice, and I'm very choosy regarding my coffee mugs.