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Why? If they have value then others will vote. Opinions differ on this. I only voted on mine to counter the flag

I think the value is in activity. Anyone taking the time to comment should get something unless it’s a worthless or irrelevant comment. Of course by power is so low it doesn’t make a big difference. I use 100 pct out of laziness.

Also if you don’t think your post has value why comment? If you do why not vote?

One issue with self-voting comments is it moves them up the page. I think it should be up to the post author and others to decide what comments have value. I don't comment with the expectation of reward, but I know a lot of people do and I'm less likely to vote on those I don't consider sincere. Steemit is not just about grabbing money. It's a social platform where people should be interacting. I very rarely self-vote. I've only done it recently to counteract some flags.

The stats can be interesting :)