Where do you source your books? I love my Kindle as an ereader and I get the books from my library, which sends them to my Kindle via Amazon. So I am connected to the internet.
I read classics and old books, the authors are long dead so I don't feel bad about downloading these. If you mostly read niche or brand new books it probably isn't as good. You can find a lot on project Gutenberg, archive.org, &c.