I would like to encourage users to look for dup questions before posting questions, and users to look for duplicates rather than throwing in new answers or copying answers from the dup and pasting them in to get the quick 10 minutes of upvotes before it gets closed.
Just to note, I'm taking pains to make sure that this request does not overlap with Options to Port Answers on Closed-as-Dupe Questions or Allow high rep users to migrate answers from one question to another. Its goal is not voting-to-close for high-rep users, as the previous one was closed for. This is minor encouragement for the masses without giving them executive privilege.
My suggestion is as follows:
- Receive notification if your question is closed-for-dup, or if you posted an answer on one that was closed-for-dup - this gives users the option to ask for their answers to get ported by moderators, as per the above links
- Make a new "flag" type: "Duplicate Question" - requiring a link to fold into
- If you flag it as dup AND do not answer it yourself AND it actually gets closed-as-dup by a moderator AND the link is the same, you get either a rep bonus (+5 or +10 maybe?), and/or some badges for helping clean up (Janitor for 25 times, Consolidator for 50, "The Cleaner" for every 100 thereafter? :-)
Optionally, maybe halve the value of questions and/or answers on duplicates. This would encourage people to look before they ask, and encourage people to distribute the responsibility (and reward the behavior) of not proliferating duplicate answers just to snag a few points. And encourage them to port answers to "real versions", thus consolidating.
As an additional benefit, if more people do port their good answers over to the "original" question, then more questions with no useful purpose will result - and can thus be cleaned up, leaving less spam around when looking for an answer to a question. Hopefully, that, in turn, will make it easier to find questions, and make it less likely to post dups in the first place. :-)
And yes, the irony isn't lost on me that this was extracted and refined from something closed-as-dup asking for closed-on-dup functionality. My brain itches. ;-P