Copywriters exist to help you sell. But you will find that one unexpected bonus of employing an outside copywriter is often great ideas.
When you explain your enterprise to an outsider you will often highlight strange practices, things taken for granted or accepted as the norm.
A New Brain
A freelance copywriter will look at your project with fresh eyes, unbiased by prior knowledge of your company. So there is a good chance they will see possibilities that were invisible to your staff.
Picture courtesy of Tiago Daniel Silva