Ok, this strategy would be extremely difficult to pull off, but easier than going in blind.
So, once the last hour of the tournament is up, of all the people still alive, the person with the most kills (from the last hour) wins the $10k. So what if a leader, lets say Sp33dy20, trained his defense only until the end of the tournament and got insane tank gear, and then killed all but a few of us during the last hour. This would give him an extreme amount of kills, so that all he'd have to do would be survive the last hour.
Just a thought.