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Every time you vote with Vote Percentage set at 100 your Voting Power goes down about 2% (you can view this at steemnow.com). Voting Power automatically regenerates at the pace of about 20% every 24 hours. So with 10 votes a day you will be able to regenerate enough Voting Power to stay in the money so to speak. People can see your Voting Power via external monitors like steemnow.com and they can see what your vote is worth. 3 factors determine this 1) The amount of SP in your account 2) Vote Percentage (if you are less than 500 SP it is locked at 100%) 3) Voting Power as described above this diminishes with every vote and regenerates by about 20% per day.

Everyone can vote, but if your a minnow and have less that 500 steem. Each vote it 100%, 10 votes a day will decrease your power to *0% but after 24 hrs, it will recover back to 100%

Didn't know that till now. Thanks @otage @stackin!