I'm going to publish my first fiction book serial in late July and I'm really excited about that. The story idea is mine, but I hired a plotter and a ghostwriter to help me out. I like the result and want to pay a good bonus to the ghostwriter, however I'm thinking how else I could reward her. I know she has a few novels on Zon that don't have a good sales rank. That's not because of pure quality, but pure marketing. If I mentioned the ghostwriter as a co-author or a contributor, my readers could find her books too. I'm not going to type her name on the cover as there must be only my pen name for branding purpose, but I could provide her author bio at the back matter with a link to her Author page on Amazon or to her website.
Is that a good or bad idea? Any pros and cons? I know we should sigh a writer agreement to protect my copyrights and royalties, but what about other possible disadvantages?