I don't know. Liking your own post is almost available on every social media. Very few of them (like Reddit) automatically upvote or like your post you've just made.
That's fair, though kbin is built to be comparable to reddit and with the way the feed sort algorithms work, surely having more upvotes improves the visibility, so why not?
Or even better yet, make it an option that you can turn on or off per user.