You should Upvote your commenters
I upvote 95% of my commenters and here is why:
To help them grow their accounts. If I help the people who are commenting me and upvoting me, I will give them more steem power. When I give them more steem power, they use that same steem power to upvote themselves. And ME!!
Thank you for auto-voting me: http://bit.ly/autovotes