With some dorms being immediately adjacent to classroom buildings, many students are hesitant to give up the luxury of a few extra minutes of sleep. It's the best spot on campus because it's only a short walk to classes. It's pretty hooked up, like a five star hotel over here. There are seven dining commons on campus, three of which are located either in the dorms themselves or are accessible through indoor walkways. The dining commons may be an incentive for some students to stay in the dorms.
Ethernet is another incentive.
According to the Residential Computing Service and Support Home Page, an Ethernet card communicates over the Internet about 100 times faster than a modem. I would probably go through withdrawal. Every dorm room has access. Although these tangible conveniences play an important role in a student's decision to stay on campus, the cost of living is also a factor. Other students like the dorms because they give them the opportunity to stay close to friends.