Everyone certainly has the right to vote on their own content.
But perhaps if there was a limit- for instance 2x per day, it wouldn't be such a hot topic and everyone could insure their stake increases at a rate consistent with their investment (as long as they make the effort to post 2x per day), at the same time as rewarding others in whichever fashion they choose.
I've always self votes. But I don't think I've ever posted more than 2x in one day. As long as it isn't blatantly ignoring the social responsibility we have to eachother, I don't see a problem :)