MadYuri, Teyon locks the voting threads to stop the voting phase and lock the "Advanced users, please post your final challenge entry here..." and "Newer users, please post your final challenge entry here... " threads to stop anyone from posting images after the challenges has ended. This helps him control the challenges better. Because of the style of these challenges, this works best for him. But this brings up a good point. Not all threads are locked because of TOS issues, there could be other reasons, as shown here.

You can't call it work if you love it... Zen Tambour