I enjoy proofreading, but I don't enjoy editing. For instance, in the above example of changing a typo from "I'm reading my book last night" to "I was reading my book last night," a copy editor/ghost writer would have to take into consideration the active voice and actually change it to "I read my book last night." Add to that POV/narration, imagery, symbolism, tone, sentence structure, cohesion, etc., a person can't even enjoy reading for the pure satisfaction of it. The same thing happened to me when I learned the in's and out's of public speaking. Now I find myself hearing all the "uh's" and "ya know's" whenever anyone is on tv and it's a real distraction.

Unless you really enjoy parts of speech and the pure aesthetics of the written word in all it's forms, I say go for proofreading. It's easy, fun and enjoyable. Well, that's just my opinion, so take it for what it's worth and have fun!

Sue