It's about control and flexibility, I guess. I'm the creative director, art director, designer and producer simultaneously. If you have a question, the answers will come from me. This means that I can deal with and address all of your needs directly. Also, when outside assistance is necessary (photographer, illustrator, writer or printer) I know the best people in the business and can easily bring them on board.
And I suppose, this is what I love to do and can't imagine not being able to.