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RE: $0.02 Dust threshold for upvote value - don't upvote comments with a value below $0.02
If that comment is upvoted after them, then they would indeed earn a higher curation reward than from upvoting any post that is already 5+ hours old.
But if the comment doesn't get any additional upvotes then I don't think they get any curation rewards. As it will also be dust.