Use of the search feature did not lead me to any question on meta that addressed Comments earning reputation. (this addresses reviews, not Comments).
My question is based on the triangle next to a comment that (if you hover your mouse over the triangle) indicates that a comment added something useful to the post.
Having asked a few questions and posted a few answers, I have found on more than one occasion(neil slater's help on this question being a good case) that a user makes a comment that helped me improve the answer by either pointing to a new resource or a theme/concept that I hadn't folded into the answer.
While I understand "we award rep for core functions," I feel that the comment that is helpful to the querent or the responder supports the core function directly: good questions, good answers. A single rep point here and there won't break the rep system, and unless someone finds a comment helpful, it doesn't even touch it.
My recommendation is that a "this comment adds something useful to the post" flag (triangle?) being clicked awards a single rep point to whomever wrote that comment.
RPG.SE voting, now that I have reviewed about 20 questions/answers that did come up from that search on voting and rep, is biased toward up votes as a means for helping this site achieve its objectives:
Good answers, better answers, and best answers to good questions posed is why we are here.
When one of our community members provides an insight that makes an answer better, or even best, that member has helped this SE site achieve its goal of putting out good answers regarding this hobby. A rep point reward seems to fit into how rep awards incentivize participation in a constructive way.
Position contra considered:
Having read a number of meta questions regarding comments, and the problem of people answering questions in comments instead of providing answers, I can see that this might lead to fewer answers to choose from, and a worry that this would incentivize undesired behavior.
Contra to the contra:
The flip side of this is that if A's answer covers most of what B would say, but B knows a point or source that A hasn't mentioned, isn't it better that B help improve A's answer rather than post an answer that replicates A's answer but adds one more thing?
Have seen considerable discussion in meta about answers in plentitude that say the same thing being undesirable.
Maybe this question has two parts:
a. Why doesn't someone clicking on the "this comment adds something useful to the post" triangles award a single rep point?
b. Should the voting system accommodate that?
I think it should, but there may be a good reason, or some experience with this idea that I am unaware of which explains why this is a bad idea. None of this is related to the fact that comments go away eventually (allegedly). This inquiry is based on the idea of rewards for improving the in-process crafting of better and best answers to good and better questions.
Answers to this question should cover:
- This has been tried before and X happened.
Doing this does/does not support the intent of the voting system.
Doing this does/does not support the goals of SE
Doing this does/does not incentivize the behavior we prefer in pursuit of site goals.
We covered this "here" but the way you searched missed that Q