The written word is a huge industry. Publishing companies looking for
high-quality, interesting works to publish are looking for the best
possible items they can get. There is a lot of money to be made with
quality writing and a lot of money to be lost on works that aren't
quite there yet. This makes it challenging to get publishing companies
interested in buying a particular work. They aren't willing to risk
making an investment on something that they aren't sure will make a
profit.
Even when a writer reads through his work several times to get rid of
errors, there still may be errors that weren't noticed. To make the
best possible impression, hiring an editor to go over a finished work
can catch mistakes that weren't caught on the first few read throughs.
A second pair of eyes is an extremely valuable way to catch errors
before they get sent away to publishing companies.
Polished copy that flows well and has the appropriate continuity is
the work of effective editing. Without it, publishing companies would
have far more work to do to make a work acceptable for publishing.
This adds to the time spent on the manuscript which can in turn cut
down on the profit that will be made from it. That is enough incentive
for most publishing companies to turn away a work that has not been
sufficiently edited. For a better chance at gaining their attention,
make sure a work is polished by an experienced editor.