Getting published is harder than you think. There are assignment editors to deal with. If books are your thing, then you will have to find a good agent and then deal with publishers. On top of that, everyone wants to be communicated to in specific ways.
Once you sit down to actually write, it is helpful to have someone guide you on how to get your idea from your brain to flow through your fingers and onto the computer screen. Established authors, many times, also benefit from having someone to check in with and cheer them on to that last page.
A coach can help get you from conception to completion.