This question already has an answer here:
Is there any benefit of your comments being upvoted because I have a few and nothing is happening?
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marked as duplicate by raven, hims056, Martijn Pieters, gnat, Tobias Kienzler Jul 17 '13 at 12:21
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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18It just indicates that its useful and if anyones just scanning the comments they should read it, it has no other effect (apart from a badge) – Richard Tingle Jul 16 '13 at 20:59
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5Thanks you for that – Ollie Jul 16 '13 at 20:59
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7@RichardTingle You only posted that as a comment so you could demonstrate the answer, didn't you? ;) – Andrew Barber Jul 16 '13 at 21:09
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6Comment upvotes all round – Ollie Jul 16 '13 at 21:10
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6Lol everything here has upvotes ;) – Ollie Jul 16 '13 at 21:13
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8I've now actually run out of my comment upvotes for the day, i'm blaming you @user2568107 – Richard Tingle Jul 16 '13 at 21:14
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5Ha ha ha ha ha ha – Ollie Jul 16 '13 at 21:17
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4Hey who downvoted my question??? – Ollie Jul 16 '13 at 21:18
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5@user2568107 +1, good question, I have actually wondered this myself. Thank you for the answers all, explained nicely. – user226423 Jul 16 '13 at 21:26
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5@user2568107 Not me, I was considering upvoting but guess what I've also run out of – Richard Tingle Jul 16 '13 at 21:27
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3Also, You can earn a badge for upvoted comments – hims056 Jul 17 '13 at 11:24
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It just indicates that the comment is useful and if anyone is just scanning the comments they should read it. These comments are also shown preferentially if only some of the comments are being shown.
It has no other effect (apart from a badge)
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When a question has many comments only some are displayed, preferred visibility is given to the comments with the most upvotes. This can be important to have a later comment be shown without expanding all comments.
