All fair points. I believe that those who are too narrowly focused (read, on themselves) when upvoting ultimately won't do very well here, so they kind of weed themselves out. For that reason I'm not too concerned. Personally, I avoid commenting or posting unless I actually have something to say, and I think posting empty words will also ultimately hurt someone because they then get the reputation of producing poor quality content. Again, those people will weed themselves out.