Cory Doctorow, writing "In Praise of the Sales Force," notes that
The best definition I've heard of "publishing" comes from my editor,
Patrick Nielsen Hayden, who says, "publishing is making a work public."
That is, identifying a work and an audience, and taking whatever steps
are necessary to get the two together (you'll note that by this
definition, Google is a fantastic publisher). Publishing is not
printing, or marketing, or editorial, or copy-editing, or typesetting.
It may comprise some or all of these things, but you could have the
world's best-edited, most beautiful, well-bound book in the world, and
without a strategy for getting it into the hands of readers, all it's
good for is insulating the attic.
And, who is most effective in "making a work public?"
... a sales force. That is, a small army of motivated, personable,
committed salespeople who are on a first-name basis with every single
bookstore owner/buyer in the country, people who lay down a lot of
shoe-leather as they slog from one shop to the next, clutching a case
filled with advance reader copies, cover-flats, and catalogs.
... This matters. This is the kind of longitudinal, deep, expensive
expertise that gets books onto shelves, into the minds of the clerks,
onto the recommended tables at the front of the store. It's
labor-intensive and highly specialized, and without it, your book's
sales only come from people who've already heard of it (through word of
mouth, advertising, a review, etc.) and who are either motivated enough
to order it direct, or lucky enough to chance on a copy on a shelf at a
store that ordered it based on reputation or sales literature alone,
without any hand-holding or cajoling.