I make no apologies when claiming to love reading. I was reading before I went to school, thanks to my parents reading to me every night.
All writers start out as readers. If someone tells me that they write books but don’t read them, I can’t help but wonder how he knows to construct a sentence, a paragraph, a story arc, and how to avoide clichés and stereotypes. How does he know what genre he is writing in, and what is already in that that genre.
So, a successful writer has to be a reader, for many reasons. Reading is the gateway to being a writer, any sort of writer. Off the top of my head, I read for:
4/ Even more research (I do a lot of research); and
5/ Educational purposes.
Reading for research! You need to research for both fiction and nonfiction texts. I’ve done enough research to fill a library with historical detail for my Steampunk novels; and I still feel like I’ve never researched enough. I find it is easier with my scientific articles, because I can list my references!
Reading has physical and intellectual benefits apart from supplying inspiration and verisimilitude to your prose.
This is why I have ten bookcases in my house and shelves packed with a double layer of books.