Allow asker to upgrade comment to answer
In the Q&As
the OP finds his solution in a comment and asks it become an answer.
A possible reason is the accept rate issue.
So these comments should become an answer by the user who owns comment?
What are the criteria for converting a solution comment to an answer?
EDIT: I think
criteria is not the right word but instead common behavior:
What is common behavior for converting a solution comment as answer?
Making a comment to an answer is extra work which brings, accept rate for OP and some reputation to the user who answered?
What are the other useful and useless sides?
Note 1: From my point, these two Q&A are the first time I have seen this issue at Stack Overflow. Then in the second Q&A, I tried to make an answer extract from the reference link by adding more code.
Note 2: My English does not work sometimes, sorry for that, I mean this