That's a pretty cool thing to have :-)

I don't really have a problem with people up-voting their own posts, or even comments honestly, as long as there is actually value in them. I've left many comments that are many paragraphs long, and I feel those have some value that would be nice to have paid out.

My problem with self-upvoting is only with people (or bots in this case) spamming worthless messages, and draining the reward pool to pay themself for them.