I 100% agree that self-voting should be encouraged. My thinking is this: I should upvote content (whether that is posts or comments doesn't matter) that I deem to be valuable. I also believe I should only post content that is valuable. Therefore, if I post something, I believe it has value and therefore it deserves an upvote. If I post something that isn't deserving of my own upvote, then why am I even posting it in the first place?