Like you, I'm having a heck of a time trying to get people to actually READ the entire post and engage with it by commenting. I like to reward all my commenters with an up-vote to show my appreciation and thus encourage more comments.
I made a reply to the link you provided. It is only my own opinion as there are no hard and fast rules, but I prefer to be on the cautious side. One flag from a whale can knock your reputation back to nothing!