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That is not a silly question at all.

When you up vote your own post you are creating a higher payout for the author (you) but you do not receive any curation rewards. You can see your curation rewards in your wallet (under rewards) and notice you don't get paid for your own post. You can get curation rewards for up voting a comment that someone else made under your post. Such a reply is considered a separate post and has it's own reward pool.

Of note:
Last I read, curation that occurs within 30 minutes of the submission of the post is percentage based and goes manly to the author. An up vote on article just published gets less than the 25% and most of it goes to the author.

If anyone has any more information on this later portion please update us.

Thanks for the reply!

So when we upvote our own post that means others upvoting it get a lower payout? Seems like we shouldn't upvote our own posts. Is there a way to undo that for a post already published?

Hi, Thanks for the reply.

Up-voting your own post does not take away from the others. It may change the ratio a bit, but anyone that up-votes, shares in the full curation pool for the post.

Thanks for the reply. Very informative! :)