<p>Well no, I don't believe it harms steem in anyway, but as far as steemit goes then I think it does a lot of damage. The concept of steemit is to serve as a platform to reward creativity so when people power up and shamelessly upvote their posts, comments and replies, it devalues the entire system.</p><p>Now this is not to say that people shouldn't upvote themselves, no, if you make a post then you have every right to do upvote your post, but making it a habit to upvote yourself 30 times a day is doing nothing but raping the steem reward pool.</p><p>Imagine if musing decided to continuously give itself 100% upvotes till it's voting power reached 0, it would make steemit look like a mediocre site where you can make an investment then get it back by continuously pushing a button.</p><p>As far as the steem blockchain goes, I don't think it does any harm but the idea and concept of steemit is brought to shame when people do such.</p>