This is an example of a custom page. With your subscription, you get three custom pages. For a good example of a custom-made page, check out the "About Us" page.
The blog section of each site, along with the ad campaign landing pages, and events/venues/product pages are already included in the subscription (they do not count against the three custom-made pages).
Additional pages are charged by the hour to develop but the additional pages will not increase your monthly subscription cost. Each subscription is credited 12 free hours per year.