From my personal experience.

People who don't stop spamming me here or on Twitter won't get an upvote from me (or I'll be a bit reluctant, at least). I hate when people brag for upvotes. And I don't consider myself greedy or something. I'm sharing everywhere and whenever I can.

IMHO +1 post a day is already 'too much'. being 1 every 1-3 the optimal balance between quality/quantity.