Not really a discussion, more of a cautionary tale:
I sometimes write answers that are basically just compilations of facts that have already been noticed in comments to the question, but which I think add up to a resolution of the problem. Usually I mark these answers as CW, because I don't think my essentially clerical contribution warrants me getting reputation from upvotes.
Recently I noticed that when the OP accepted this answer (which was CW because originally it was only one line), the OP did not receive the usual +2 rep for accepting an answer.
It appears to be by design that accepting a CW answer does not gain the OP +2, but it was certainly not my intention to penalize the OP in that way when I CW-ed my answer.
In the future I think I will just write ordinary answers and soak up the unearned rep gain myself.