There’s a saying amoung SEO’s that “content is king.” The more content you have, the more content google (or any other searh engine) has to match up queries to. The more unique content you have, the more valuable you become to google and more importantly, google users. Google actually avoids indexing pages that have the same content as pages already indexed.

Take wikipedia for example. When was the last time you did a search and wikipedia wasn’t one of the first results? It’s been awhile for me. Just about every page in wikipedia is full of informative, unique content.