I occasionally do this, but I doubt that awarding badges for this is a good idea. Let me describe a few cases as I think they explain, why this may not be a good idea - at least not as a rule.
- A relatively common reason for turning your answer CW right away is that the answer is a summary of comments from several users. Henning coined the term Credit Waived for this. This is done basically to remove one straight forward question from the unanswered queue. Any merit associated with this might be called "house keeping", but a robot cannot reliably identify this, because...
- I occasionally turn an answer to a simple question CW right away (or with a bit of delay, when a couple of upvotes may already have arrived). I couldn't think of a good hint, so I just answered. But why CW? On a good day I like to think that it was still fully in the spirit of Credit Waived. But may be I also felt that I don't want my name tarnished by any reputation "earned" by answering a question such as this? Who knows - I don't know how my subconscious works? I don't know for sure if such CWification is a sign of a humble mind or a haughty attitude ("this question is so far beneath me that I don't want your upvotes, no thanks"). Anyway, with fuzzy motives it doesn't feel right to get a badge for this. It might have been better for me not to answer such a question at all?
- CWification may backfire. Evidence from a popular Tetris question. Many of us posted essentially an identical answer within seconds of each other. We all started raking in upvotes. After 20 or so upvotes I felt that the joke had gone far enough, and CWified my answer. Then it turned out that we the choirboys were wrong. I would deserve a few downvotes for giving a wrong answer, but CW protects me from that. Arrgh! Doesn't feel like a badge of merit would be right, does it?
There have been in-between cases. How much original input should you have, if you summarize comments in an answer in order not to CWify it? I don't know? Happens relatively rarely, so my policy has not converged.