Limit the number of votes :)
The UserVoice seems to have unlimited votes per user (I'm not running out). Some other products gave a quota, which makes one think more and leads to more presentative vote counts.
(Also, no category for improments on UserVoice forum itself.)
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1 comment
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Sean Ellis commented
Each user may vote on each idea once. This seems fair to me and avoids the ranked voting paradox.