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Yes, I agree its courteous to upvote a comment on your thread. It what way does Steem power affect comments? Aside from- the Steem power of someone giving a comment an upvote would correlate with the amount that upvote produces- if indeed that is a correct assumption itself?

That's how. It also helps your reputation. Also notice you can choose to rank comments however you want default to trending.

Great thanks! Just making sure I understand. :) Thanks for your input!