Very true, some of the classes have very little value. I can go to any auditorium based class and sit in the class and the professor would likely not know. The TA's might but mostly I can be there and learn. There are no security guards. What people pay for is that final grade and the degree you are working to get. You can even hang out on campus. When I was getting my degree there were always former students that would hang out.That was there base of operation.

Strange how it works.