graying would serve to make it slightly more annoying to see/click -- to dissuade casual upvotes. You could also make the hitbox of the button increasingly sma

graying would serve to make it slightly more annoying to see/click -- to dissuade casual upvotes. You could also make the hitbox of the button increasingly smaller - to where the no.2 comment has a 1x1 px box. tl:dr make it frustrating to upvote top comments -- if they really 'deserve it' people will go out of their way to do it