I misunderstood your last post because I have not much knowledge of reading graphs that's why I was bit confused, also I'm not a native speaker of English.
But THIS POST I can understand it clearly and do comment after understanding. I always do quality comments on numbers of posts and getting rewards (you can check my comment section to judge my honesty).
You are right, this is the times of readers that they understand the authors post who put his efforts in making quality content then leave comments and question about the topic of content.
You have well-explained all DOs and DONTs. I never used anywhere 'Thank You', 'Nice Post', and buttering comment to anyone. I always tried to understand the above post then pushing myself to comment.
You are free to flag those comments who are mindlessly quoted for not reason or maybe to get a vote. Lemme clear you if still, you don't want to UPVOTE my any comments then I do not mind ever. If I spent time to read your content that mean I got something valuable and learned much. :) So I would love to offer you THUMBS UP!! :)