According to the Wall’s friends at Parking and Transportation, it’s mostly two things. The first is lack of space on campus, which creates a lot more demand than supply. The second is more subtle: prices are partly high to encourage people who can to use other ways to get to campus, like the campus bus system, public transit, bikes, or feet–that makes for a greener campus, a healthier community…but it also helps with the first issue. The walls at T & P are sympathetic, as is this Wall.