A couple reasons that may overlap with others: 1) administrators getting bigger compensation, 2) regulations - there are whole units in colleges and uni.s dedicated to collecting and managing data and generating reports for federal and state agencies, private organizations (U.S. News), etc. - these are regulatory compliance jobs, not teaching, 3) student perks - nicer dorms, nice fitness center, better dining options (how many of you had a dorm with one big communal bathroom for the hall? Has any university built one of those lately?) all of which raise the cost of tuition, 4) related is the array of student services - staffing centers to support x, y, and z group or interest. 5) related to 2, policies and regulations have become so complex, we have to hire managers for things that faculty used to be able to handle as part of their jobs. I.e., distance education is heavily regulated so there is an office to manage it all now.