What are the benefits of a Web Content Management?

The question of why is probably best answered by giving you a list of benefits and then briefly explaining their significance;

Your site: You own your site and can change as you need, when you need. No more web agency middlemen 'thinking' they could do it for you next week.

Content is 'King'
Change with a browser: Editing can be done with a browser (not all sadly) and can be done anywhere an internet connection is available. No more waiting weeks for your agency to get around to your updates. No more expensive application installations on your computer.
Content is King: The design of the site is split from the content using 'presentation templates'. Once you have your design therefore, forget the design and just concentrate on your content. Content is King.
Design change is easy: Site design changes are made easy. Change your 'few' presentation templates and you have changed your 'many' site pages.
Do it all quickly: Create your site and its layout rapidly, testing as you go. You will be surprised how quickly a site can be created. The 'tweaks' of course take a little longer!
Technology pool: Enjoy full control over site technologies such as page security, forums, image viewers and even ecommerce with a few click of the mouse. If you need a new mechanism just for you then it can be built, added to WebStory and be available to any page you need. With WebStory you needn't ever be left behind as the internet revolution proceeds unabated.
Deliver dynamically and on time: Use dynamic page functions to speed your site design e.g. add a dynamic page list to a page. Whenever a new page is added to the site, it automatically gets added to the list without requiring an edit of the page showing the list.