Simply put, every time you downvoat, it will take ten of your accumulated CCP. This will keep people from downvoating like crazy because they'd run out in a short amount of time.
Edit:
Excellent points on punishing people who downvoat correctly.
We could perhaps make a system in which a number of downvoats will flag a post. A moderator will look at the post and determine if it meets the requirement for spam or whatnot. Then the offending post is removed, REWARDING the downvoaters with 25 CCP. It would be in effect be a deposit on your downvoat. should you downvoat effectively you will see a net gain in CCP.
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[–] SurvivorType 0 points 3 points 3 points (+3|-0) ago (edited ago)
It would also hurt people downvoting spam, especially the ones who frequent /v/all to keep it down.