I guess I have different considerations due to my account's stated mission, you're right, it would be nice to upvote those who have upvoted me the most in kind to repay them, but I think they themselves would prefer if I were to distribute it further outwards in whatever ways possible. As a whole system trickle down does not work, but there are definitely some people who could give less of a fuck about absolute maximization on steemit and I think without them the platform would be deader than dead.