Well I am representing the book I just ghostwrote for a woman and if main stream publishers do not jump at the chance to publish it, I will turn to self publishing as a way to get the job done. It is a viable choice to any writer. Check the company out first, some are terribly corrupt. Check out Editors and Preditors, or talk to other writers about who they used and if they were happy.
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Take a peek at my BLOG:

http://charleen-micheles.blogspot.com/