After installing a WP blog standard site, you can install other programmers developed Premium Themes that work using the core WordPress installed. You must have noticed that WP blog are awkward you can’t easily customize or add pages elements. It’s very limiting.
This premium WP themes I found give great control on the page look and elements in it. There are themes specific plugins and all plugins for WordPress work with them too. See the different == Niche Market Themes
Basically Internet entrepreneurs 2 main interests are Web Stores and Directories and within each group lots of niche markets to target. Visit my stores below.