I already have a website with content on it. And Im using a blogging component that I paid for on the site. But I like the layout of this template. Its more versatile then the built in Joomla blog layout. Now I can have a Blog on my site that has a layout that looks like a normal blog.
Wordpress is also a CMS but it doesnt have the versatility of Joomla. Using this template allows for me to have a great looking blog on my website. Along with all of my other regular articles and content. And still be able to use all of the components and modules that are available to Joomla and not available to Wordpress users.