WordPress is a very user friendly on-line platform. It is much easier to update than a static HTML site and Google Loves WordPress. Even if you never intend to have a blog on your site. WordPress will display your content and do it in a very SEO friendly way.
Not exclusively, but you get more bang for your buck with WordPress, (translated) I can get a lot more done in an hour on a WordPress site than I can on a static HTML site depending on the project.