Question: You may have seen this situation a lot of times: 

A guy answers the question in a comment, but comments are easy to become forgotten. Thus another guy takes the original author's solution and posts it as an answer, which is great for a lot of people, but it is originally not his solution. 

Wouldn't it be cool, for the second guy to offer the credits to @OriginalPoster?

Example: [Glassfish DeploymentException: Error in linking security policy for](https://stackoverflow.com/questions/7322476/glassfish-deploymentexception-error-in-linking-security-policy-for/18699520#18699520)

Answer: 
If they wanted the reputation (or honestly, even if they didn't) they shouldn't have posted an answer in the comments; they should have posted an answer.
Adding a comment isn't answering. 
Notice that comment has max length and answer havs minimum length and that because they have different purpose.

When you comment you don't take any risk (mainly of down voting). The person who answer takes risk and should check and append to the solution described in the comment.