Not only do valued comments make some Leo along with hive etc. But they also do the following.
Give the entire site a new vibe in terms of interaction and something others will look at and want to be a part of.
Exposure for yourself for when you write your own articles. By leaving a valuable comment you can be for sure that I will take a look at your profile and check out any recent posts you have made. This is often times how I find under valued members on Leo and Hive and drop them support. By showing you value my content and you spend the time to read it, vote it and comment it means you yourself are invested in the success of Leo.
It can spark new ideas, partnerships and new development as ideas get thrown around. I firmly believe in not getting mad at people based on opinions. We are all human, make mistakes and don't always have the best idea ourselves. By being understanding and seeing others views we can paint a better more clear picture and path forward.
RE: The Numbers Are In: Getting Paid For Engagement