Humans are lazy. We are incredibly lazy. So lazy, in fact, that we are reluctant to type those four extra characters: www.

http://indiana.edu takes you to this:

http://www.indiana.edu takes you to this:

It’s kind of like how http://lib.msu.edu doesn’t load and http://www.lib.msu.edu automatically forwards you to http://www2.lib.msu.edu. Don’t ignore your type-in market, dudes, especially if you’re a site that isn’t likely to have as much search engine traffic after the first time they find it, like an university or an oft-used resource.