WHY HIRE A PROOFREADER OR COPY EDITOR?
Proofreaders and copy editors help avert costly and embarrassing situations like the following:
Only a human can spot certain errors
Spell-check and proofreading programs do a fair job, but they can't tell which word you really meant to use. For example:
"It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wipe."
Jane Austen, Pride and Prejudice
Only a human can spot an error like that!