It was @paulag who told me some weeks ago that's it's very important to have good curators. And that's why I agree with you that good comments deserve some love as well.
That tip of going through your comments and separating what the valuable ones are is very good and I will try that out. But usually I interact very fast with the people commenting my videos. I should probably wait a little longer.
Since I have the slider I also started upvoting comments. Just a little symbolic amount but my true appreciation to a very good comment comes with the answer and sometimes the discussion that starts with it.