Not voting anyone else is insane. You said that it is selfish but in my eyes that is also very stupid. That person is actually losing curation rewards by not voting. I don't think that I used phrase ,,make it make sense.'' But it this case it seems really appropriate. I remember that when I started blogging I went to the other extreme. I voted many posts( some of them even past payout date). I imagine that my mana was at zero at that time...