For me, cost per hour of involvment cost, game < book << dvd, sometimes with the double angle brackets on the left and sometimes not on the right. However, I don't re-read novels, and only re-skim technicals.
If you never reread something, I'd argue the best route for you is a library, as opposed to buying. Especially now that some of them even lend e-books.
Most books I own, I have never seen in any library near me. I'm sure this varies from region to region, but I stopped getting much value from the public library in high school, and started collecting my own. Even my university library where I went to school, with its plethora of fascinating books, has little overlap with the shelves in my house.