It was meant more as a question to the moderators. Does it help them not to miss stuff if it's reported multiple times or does it just spam up the queue of reports? I think that seeing a post has already been reported would mean most people would not report it again. Is that a good thing or a bad thing?
In my point of view, making the report transparent helps everyone to question why a moderator has not deleted or archived a thread. I have seen so many low quality threads with full of spam, that I have reported, but they're still there.
Maybe it's better if we can set them to "ignore" as d5000 suggested.