Curation rewards on comment upvoting is pretty low since genetally posts attract more upvotes than comments. But, it's still worth encouraging engagement via the comments by upvoting them. For minnows, a well thought out comment is worth more than a penny upvote on a post.
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Not always. Upvoting a Post together with 100 other Steemians let´s you end up with a very small portion of the reward while you receive a big one on comments. Most important though is to show others that you value their words, which is just priceless and can´t be compared to any curation reward :)