All of us have not the same ability to produce regular unique contents and as well as quality writing, whcih we know that Google (After Panda update) or other main search engines loves to rank and prefer unique contents which are well written, legibly constructed easy to understand.
Due to the face that quality content are deciding factor when it comes to search engine results, every SEO expert or website owner like to have fresh contents, Sometimes they do not have enough time to write these contents, or in some cases they do not have such skills to write flowing copy which is attractive to the eyes.