Self-promotion is great, and there are multiple ways to implement it in business strategy, especially if you work in a team.
For designers that like to think, we offer the latest collection of books that not just teach, but also motivate to create more interesting and complicated projects.
For a business site owner, it is important to attract clients with the help of quality content. And for the designer, it is pretty important to let the users (customers and the owner) enjoy the quality design.