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It is still there. If you vote within the first 30 minutes you will share part of your curation rewards with the author.

To simplify it - if you found an amazing post that didn't have anyone voting for it, and you voted for it right at the 30 minute mark, then after that a ton more people found it and voted on it and it made it to the trending page - you would get a large amount of curation rewards.

Still confused as to where the extra comes from though..

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