The default upvoting is only for new users. Honestly, not sure why... not like your vote is worth much at that point.

Eventually it goes away. Personally though, I think people seriously overthink the self-voting thing. If all you ever do is self-vote, that's a problem. But once or twice a day should be fine (more than that and arguably your voting power drops too much) and then you can use your other votes for other people's quality content.