We may be talking about different services. I’m referring to a full read that usually creates a 5-10 page edit letter–no in-line editing. Or, perhaps we’re just working in different corners of the market. I’m around those who are freelance editing pre-query for writers hoping to traditionally publish their genre fiction, not the kind of rigorous editing a self publishing author would need, which should rightfully be much more expensive! It’s true that most people doing freelance editing at the lower rate/rigor aren’t doing it full time. It’s an optional step for those traditionally publishing, and the prices reflect maintaining access for those writers, I believe.
Obviously there is a big difference. I actually started with screenplays (with some mild success) partly due to hearing that as long as you have a good story, the grammatical errors won’t be a big deal. Well, that was not true. Maybe if a producer liked the story or I was already established but every contest I entered always came back with feedback about the grammatical errors. Even if I won or placed as a finalist, I always received critique on that. Very little is spelling error, it was more about structure, etc.