It's because payouts depend on the Voting Power of voters. The more you vote, the more this power goes down, and the rewards go down as well.
People who vote for your post will upvote other stuff, so the payouts are diluted.
Check this link : https://steem.io/getinvolved/posting-rewards/
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@marcdebrouchev Thank you for your answer and the link. It's really helpful :)
interesting!
Hope it's helpful for you :)