Actually it takes quite a lot of people to produce anything worth while that you’ll see on TV or at the movies. The tools used to make special effects are extremely complicated and slow, and people are more or less specialist in specific areas. It’s like a production line at a car manufacture. Sure one guy can build a car, but how long will that take. With multiple production studios working together things get done a lot faster so people can enjoy their what ever every week or go to the movies and see those incredible special effects.