Personally (and you might agree with this) I think a comment, even a very simple one, is a "greater effort" thing than a payment.

(Which may actually be an argument in favor of either, depending on the circumstances).

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It depends. If I think the user posted a piece of content looking for a v4v rationale, for example, a journalist posting an article, I try to act according to what I think for him is the greatest value at that moment. A response doesn't help him pay the bills :)