Each individual component often relies on dozens to hundreds of other components. Even mid-sized organizations consume tens of thousands of components per month. Your developers waste time downloading a massive library of dependencies from the internet. With a repository your organization can reduce build times, improve collaboration, enhance control, and more.
To learn more about the benefits of a repository manager visit http://www.sonatype.com/nexus/why-nexus/why-use-a-repo-manager