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https://steemit.com/faq.html

Will the reward pool pay out more or less depending on who votes?
There is a fixed amount of STEEM coins that gets added to the rewards pool each day. In the short term, the amount of coins that get paid out may be higher or lower depending on the amount of voting activity, but over time it will pay out the full amount of rewards regardless of who votes.

Votes in Steem are stake-weighted. Therefore voters with more STEEM Power have a greater influence over the allocation than voters with less SP, but their votes do not increase the amount of rewards.