(Farce alert) I only upvote in the most selfish way possible : I upvote myself with my other accounts, I upvote all replies and I downvote all other concurrent replies.
I'm kidding...what's the point ? [1]
Seriously, I'm always interested on how MICRO level disparate motives like these here aggregate on the MACRO level (in every area). I sometimes only view the monthly top HN, and I'm often like : "hum, why is this one so popular while this one is not ?"