One of the best things on the entire cPanel hosting system is the ability to access Fantastico (basic or Deluxe). With this very flexible program, many things such as blogs, navigation tools for your site, and many other content management tools that you can experiment with and come up with the best page to suit the needs of your customers and you.
This very valuable application can also help you set up discussion boards, deal with e-commerce issues and help you to set up and maintain your php lists. You can set up polls and surveys, take care of project management and provide a photo gallery for your use. This is a system that keeps on giving to the webmasters that take advantage of this very versatile function.
With the availability of being able to assign the bandwidth and disc space, control over your e-mail, quick installation of many scripts with the Fantastico system and just the control you have over your entire system, the answer to why do you need this should be obvious.