Avid book readers can make anywhere from a few dollars to a full-time salary from reading books, depending on the opportunities they pursue. For example, an experienced book reviewer might earn anywhere from $10 to $100 for reviewing books, which varies on a book-by-book basis.
A book editor in the publishing business, on the other hand, might earn tens of thousands each year in their full time job. In either case, the more books you read as part of your professional endeavor, the more money you can earn.