You can get a ghostwriter but the idea here is that YOU pay THEM for writing it. No offense but unless you're already in the industry with a reputation and success, nobody cares about your ideas because the truth is that EVERYBODY has ideas and EVERYBODY thinks they would make really good novels/movies/games.

So if you think the idea is so amazing but don't have time to write it, pay someone else to write it for you. Don't expect to get money for having thoughts.