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So only those who buy steem have the right to get big upvotes! It can be argued that his post was spam or not, but I think downvotes only bring disappointments and hatred on steemit. Probably things which are really offensive, fake, plagiarism etc. should be downvoted. I feel sad to see posts/comments being downvoted, which could be avoided by probably discussing it with author.
Just my opinion. Of course, it's your power, so it's your use. 😊