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The rewards pool is shared by everyone. When someone sees a post that they believe is taking too much, they downvote it. Your post has a pending payout of over 30 STU which is very high in my opinion.

My other issue is your attitude towards your downvoters. You have chosen to downvote their posts because they downvoted your post. This is not an intended usage of downvotes. Doing this will land you in downvote wars, which is not a smart idea. Unless you want more downvotes.

I suggest that you learn from this. Downvoting is going to become a bigger part of Steem now that downvotes do not consume upvoting mana. I wish you well.