I think the only time self voting would be a problem is if all the high steempower holders were doing it, but they're not. Only people who self vote their own comments are minnows who make little to nothing anyways, which you can't really blame them anyways because of the high influx of new users the last couple of months, feels almost impossible to get seen.
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Some numbers : https://steemit.com/project-smackdown/@personz/project-smackdown-14th-july-stats
While you may be right it is mostly the new users who do it, they are causing an awful amount of spam comments that but that seems to have slowed down as they may have noticed their voting power become inefficient after many votes.
The race to Nash is futile.