We can't help someone gaming the system. It will always happen. This guy has much more to loose than we do, so it is also in his best interest not to spoil the platform. Also, if his bot earns income by up-voting, it just proves that his bot is doing it right and up-voting content that will be regarded as valuable by humans some minutes or hours after the bot. In that case, the bot is adding value, which is perfect for the platform.
So don't worry. Figure out the system and game it as much as you can.