I see no harm in self voting I mean if we purchased steem power we can self vote.
And at tje same time craig is also giving upvote to minnows and others as well. So it is perfectly fine. Imagine a user having self vote value of $0.05 and he gets an upvote from craig worth $5 then it is great even if he gets once a week.
This comment has received a 0.09 % upvote from @booster thanks to: @cryptokraze.