According to W3Techs, Web Technology Surveys, per June of 2014, 3.1% of websites use Joomla and Joomla is used on 8.3% of the websites that use a CMS. WordPress is used on 22.3% of the sites on the web and WordPress has a 60% market share. WordPress is the most popular CMS. Joomla is second in line after WordPress. Drupal comes in 3rd, then Blogger and MaGento. After that there is a long list of CMSs with a fraction of a percentage.

On this same page they indicate that 62.9% of the sites on the internet do not use any CMS platform.

See the most recent statistics at: http://w3techs.com/technologies/overview/content_management/all

That number doesn't seem very high for Joomla, you say.

Keep in mind a few things. A large percentage of the websites on the internet have been out there for a long time. They were created long before the use of Content Management Systems became popular. So in reality, the usage numbers are skewed.

WordPress has the most sites, but many of these sites are individual people with their blogging site or very small companies with 5-10 page websites. WordPress is geared toward this type of site.

Joomla can be used for small sites as well, but it is not as geared toward a blogger with daily updates as it is toward sites with many static pages.

CMS platforms are almost a must these days

Companies and individuals are all talking to each other and they are realizing that it is much less expensive to pay for the cost of a CMS up front than to higher a web developer to make every little content update or create new pages. The old idea was that as a web developer, you had a nice steady income from site updates after you built the site. You can't keep thinking that way, or your customers will go elsewhere.

CMS platforms are easier for the developer

Once you get past the learning curve, you realize that you can have a multi-page website with built in navigation system in a matter of hours. The custom styling may take a little longer, but the functionality is built in. You do not have to be a PHP/MySQL guru to take advantage of the benefits of a database for your content. If you need a certain functionality for your website, likely there is an extension that does what you need without you having to take the time to write pages of code.

Content entry and image placement is a breeze compared to cranking out the HTML tags.