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Selfvoting a comment is always shameful, unless the purpose isbstated. Occasionally doing it for visibility is cool.
A lot of people hide upvoting their comments by paying others to do it or returning the favor. Even some services like SBI do this. Again if it is very occasional it's acceptable.
For example it is fine if someone likes the comment better than the post. However, if they are just rewarding the comment author, I think downvoting the same comment is great.

You may have to worry about starting a flag war. However in my experience such losers who upvote their own comments won't engage in anythin unprofitable. Free downvotes will change this. Just ask for help if you get attacked when downvoting for the just causes.

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Just a quick bit of input on this @abitcoinskeptic ...

"Even some services like SBI do this. Again if it is very occasional it's acceptable."

... since mine is one of the accounts where this might be seen. Simply stated, as I understand and have experienced it, SBI monitors the amount of return they have posted to shareholders. If they cannot meet their ROI objectives via upvoting posts, then they will upvote comments.

Given that I (or any other SBI shareholder) have obtained this "benefit" from investing in the success of my fellow Steemians, I appreciate this "feature" of the SBI program ...

If you have a counter perspective, I'd welcome the opportunity to hear it.

You got one for here. I think it's really case by case. The people who are abusing it are obvious. If it is one comment a day, it's fine. If it is 10 and from a private account that is suspicious.
SBI is a very social example of a comment upvoting and probably the better of the services that do it. It's also not self voting or vote trading. I don't really know other examples because I don't use them and am not 100% sure how they work.

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Thanks for your reply @abitcoinskeptic and perspective. I personally think this ...

'If it is 10 and from a private account that is suspicious."

... is the key. A "private account" ... Hopefully most Steemians are familiar enough with the SBI accounts to make the clear distinction.

I wouldn't be too worried. Most people avoid downvoting unless they are sure. I just ignore them unless I get a comment or really feel like I'm being targeted. Some people panic at the slightest downvotes that don't even take 1% off their rewards.

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