Ok, so you are allowed to vote for whoever you want - including yourself, and there is technically nothing wrong with doing so. In the Steemit paper, it even says that it is OK to do. So why shouldn't you? You only get 20 votes per 24 hours that carry their full weight. After that, the weight of your Steem Power starts to go down. That means you have 20 votes a day that you can make fully count. Think about all of the amazing content that is being posted, which goes basically unnoticed? You know how it feels to have just posted some amazing content, and then sit there and wait, patiently, hoping someone comes along and upvotes your post. So go out there and make someone's day. Upvote someone else's posts! Make your 20 votes per day count!