Maybe, it is because people here on Steem think more about that it is work than on other social media platforms because of the cryptocurrency they get.

I always upvote legit commenters in my posts with at least a vote that is higher than the dust limit so they actually get something and it works, people are actually writing some comments.

I personally not do that much of commenting people because it is time consuming, sometimes, I'll do dpoll, since it is fast and fun. :3