Personal selling involves direct spoken communication between sellers and potential customers. One can never declare that a certain tactic is proven being the best format for direct mailing. You know that you've to advertise but calculating the results is difficult.
And lastly - When you have a handwritten letter -- Do you open it?. However, direct marketing can be a really effective marketing tool, and when a direct marketing campaign is planned and performed correctly, then your seller too as the consumer can benefit. You can use your personal brand of paper, photos and images, also as your own personal distinct style and layout that can help you inform your story to your target readers.
Direct marketing is both swift and flexible in achieving results.