I guess it's for people who don;t know how to install it on their own and don;t feel like learning.
For them though, they should try
Lela Hosting
All their packages come with fantastico, which automatically installs stuff like wordpress and joomla and forums and 20 or so other awesome scripts
Installs at the click of a button, it can save you some Major time. For noobs wanting to start up a blog network or something I highly recommend them