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You can do. But if you upvote your comment that is useless everytime and its a lot of value with your vote i can just downvote it. It was about the arguments presented earlier by haejin.

At least you should be ready to get downvotes when you selfupvote.
Haejin wants to manover hisself in a position that he can selfupvote no matter what he writes.
And he wants a world where he only gets huge upvotes and nobody is allowed to downvote.
But Downvoting is usefull.
Haejin playing the victim.