Making useless comments that don't add value to the the post or doesn't encourage discussions will result in loss of reputation because eventually you will be flagged and a downvote from a whale will put you in a deep hole.
See this and please read it
https://steemit.com/spam/@swissclive/today-you-will-get-up-to-usd55-up-vote-from-me-by-flagging-or-warning-comment-spammers