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I previously added a witness vote. Removed again. Because I did not get any benefit in this. But my steem power loss with it!

But my steem power loss with it!

Not true. It cost you nothing. Witness voting doesn't affect your Steem Power or Voting Power.

Because I did not get any benefit in this.

Not true. While you are not getting direct profits, making a good choices for witness voting improves reliability and security of the platform.

It's simple: if you care about Steem, you vote.