i read books for many reasons:
1) pocket-sized entertainment w/o requiring electricity.
2) reading bulks of text on the computer is hard on the eyes, imo.
3) reading a book exercises the imagination and creativity more than watching or listening to something.
4) writing a book/novel is an art form and skill. supporting it by buying quality works is important, imo.
5) i personally personally know/knew several authors who make their living 100% by writing. i buy and read their stuff to help support them.
6) a typical book has higher quality content and more depth than what you'll typically find online.
i'm sure there's plenty more reasons, i just can't think of them right now.