I think it is good to upvote your own comments...when I take the time to write something nice, I always give it a bit of an upvote.

After HF19 I've seen myself use smaller upvotes on comments, my full power vote is now worth $20!!! Which is wild, and really cool. I've had to stop and ask myself more often, how much is this comment actually worth? If I was up-voting on someone else's comment, what would I give them?