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It is my understanding that comments do not affect curation of the parent post. In reality, comments are separate posts in themselves and get author rewards and curation values just like top-level blog posts.

I thought I had heard mention of some effect when the person that upvotes does or doesn't leave a comment.

But I knew about the posts and comments both being posts with their own curation.

I do know it is generally frowned upon to upvote your own comment without upvoting the post itself, but I don’t think that affects curation.

Oh, hah, such behavior hadn't even occurred to me.

A side note: I found a new steem app; musing.io. This is an appropriate place to ask all sorts of questions, probably even steemit ones. Cheers!