This is my experience. As a teenager I pirated about half the media I consumed. Now that I have a modest income I legally consume almost all my media (books, music and games), except for uni text books and scientific articles that aren't available through any of my libraries.

I tried following my linear algebra course using freely available materials and/or 2nd hand text books, but constant "new" editions and access to online study portals made 2nd hand books impractical.