This isn't supported by much.. The cost per student hasn't increased, only the proportion charged to tuition rather than taxes. It's easy to blame easy government money for the increase in admin staff, but during my grad program I GA'ed in the office and half of the staff were dealing with financial aid / loans / scholarships. They would be there regardless the source of the cash.
I've fought this battle on HN before and nobody wants to believe that college isn't any more expensive than it previously was, so I'll leave this here -- but do a bit of research and you'll be surprised.
Edit;
Since everyone seems to be downvoting this point, here's the inflation-adjusted cost per student in California from 1987 - 2013:
http://keepcaliforniaspromise.org/wp-content/uploads/2013/12...
It actually costs about $2,500 less per student today than it did in the late 80's -- yet during the same time, tuition has increased by upwards of 5x. That delta used to be carried by taxpayers but has been shifted to tuition.