What do you think about the cost of porn?

I have been thinking a lot lately about the cost of porn. Mostly because I've discovered that what I get most excited about watching and really enjoy, I can't find online, but I know I can get DVDs or pay-to-downloads. Why do you think DVDs are so expensive? I rarely find popular ones that are under $30. Is it because it's available for free online, so more people aren't buying as much and the prices have to be jacked up? Or some other reason? It's a bit disheartening to be a "poor college student" and not have the extra cash to blow on something fun every once in awhile. Just wondering what your thoughts are!