Thanks for the upvote on the comment.

If the collective vote on a comment or post is below 0.02 SBD it gets eaten by Steemit. Learn more here -> https://steemit.com/steemonomics/@fraenk/steemonomics-don-t-let-your-votes-go-to-dust-til-rewards-usd0-02-are-not-paid-out . So it is not so useful to upvote comments/posts if you are the only one voting for it :)