This may come as a surprise, but the industry of words is as varied as any.
There are people who pride in mass production, and there are those who specialize in the handmade tapestry.
There is grape KoolAid, and there is fine wine. There are apples, and there are oranges.
There are dozens of websites that offer a quick frantic look at your paper the night before it is due, making sure your capitalization, punctuation, and grammar meet the minimum standard. You will pay minimally for these.
There are those who can critique your manuscript, think like a publisher, read your story, and guide you to market the words you've given life. This is neither editing nor writing, but it is critiquing. You will pay differently for this.
There are wordsmiths who practice the art of language, who will craft your message in the most effective, efficient verbiage without losing your personal voice in the writing. You will pay more for those.
Proofreading is a practiced science.
Critiquing is an expert opinion.
Writing is a crafted art.
Respect the artist: the craft isn't cheap.