Omniverous Reading

We all have our favorite genera that we read-mine being sci-fi and fantasy.  However, there are so many other types of books that I like-mysteries, positive attitude, new age, herbs, frugality, craft...  Are we all like that?  Is it the book-a-holic tendency to read whatever we can get our hands on-even if it is a cereal box?  That may be a cliche but there are grounds for thinking there may be a reason for it.