Jarace I have a suggestion. First, let Graalians cast more than 1 vote in round 1. Top 10 videos from round 1 will make it to the round 2, then Unixmad and Graal staffs will cast votes (more than 1) to pick the winners. By doing this Unixmad get to see the top 10 videos himself, also I believe the Graal staffs are very fair from what I've witnessed.
I personally believe it's very easy to persuade users to get votes on a specific person, that'll be never be stoppable and unfair to everyone.
^- if Unixmad likes your video and your video didn't make it to the winner list, he can still use it for the advertisement and pay you $200 (read the OP).
I see why GOAT suggested to involve entire Graal users to counter the problem. but the most of the playerpool doesn't give a ****. So they'll probably either vote on random video, friends video or attractive thumbnail/attractive first 5 second videos.