Because student loans are were backed along with Pell Grants and other grants by banks or the Federal/State governments, colleges have been increasing tuitions whenever they felt like it because it was guaranteed money.....when they could have been using endowment cash to build new football stadiums, etc. The tuition money has been going toward improvements to the college and new things in addition to teachers and administrators' salaries. Endowment money originally was intended for the extra 'goodies' with tuition going to the normal expenses of a college such as salaries, utilities, repairs, etc.
Student loans were originating at the bank and financial institution level and paid back to the banks who had the responsibility of collecting on any outstanding debt, and even though the Feds weren't involved with the loans, they were still paid out by the banks which was another guarantee to the colleges whether the student ever paid the bank or not; The colleges have gotten so used to that 'entitlement/guaranteed' money, that unless Barney Frank can figure out a way to stomp on them like they have the banks, the colleges will continue to do as they damn well please and stay totally out of control. Nobody (Republican or Democrat) has held colleges accountable and they need to because now the taxpayer is on the hook for ALL of the money they get, not just grant money anymore.