A book with a quality index experiences increased book sales. Books published
without an index are not taken as seriously by readers, reviewers or librarians,
and book sales reflect its absence.
An index written to generally accepted indexing standards performs flawlessly,
and provides quick efficient access to information. The reader finds what he/she
is looking for and doesn't give the index a second thought. However, if the index
is poorly written, the reader becomes frustrated and will very likely move on to
the next book.