I think self voting should be regulated by the developers. I think one should not be allowed to upvote self post more than 40% per week or the reward value of self voting may be restricted to 50% of the value if it was used on others' post. Also, up-voting on one's own comment made on others posts, should not be allowed. Otherwise, self voters having high steem power will drain a lot from the reward pool and others will not be able to get enough rewards for their posts. Certainly, this will not be good for the steem community as many people will leave steemit if this problem persists.