Production company has a unique role in the production process. Production of a film has so many different components to it, it takes a team. It takes a professional with experience to be able to handle.
For example, there is crew management. This is practically an HR process for the duration of a production.
And then there is a location scout. This takes someone who knows an area of your choice. It could be a well-known beach, but it could be an abandoned building that very few people know about. A location scout is an expert in an area and that is not something that you can just acquire by scouring the web.