Yeah college is about when I stopped going to big arena shows. The prices were still $20 or less by the time I graduated, but after that they started going up, and I started hating big groups of people.
I still went to handful of festivals because it was a better deal when you could see a BUNCH of bands for the price of entry, but then those prices skyrocketed too, and my hatred for big groups of people grew.
Now I go pretty much eclusively to clubs, bars, dance halls, honky tonks, and smaller outdoor venues, to hear live music. The prices are generally $50 or less, and like I said before, still plenty of free shows from excellent musicians.