Is it worth paying for a copy-edit?

First, I’m an author, not a copy-editor, and I’m not selling any services. For my first four books I didn’t use a copy-edit as it would have cost me around a thousand pounds to do so per book, and I didn’t think it was worth it. Now I have a large publisher behind me, and have just had a copy-edit done for me (for free), I’ve basically changed my mind. 

The last stage before your words are locked in forever
When your manuscript is heading for publication, after you’ve done all you can to polish it, there are always two remaining items to consider.