Roughly 50,000 screenplays are registered each year. Hollywood studios release about 150 movies per year.
All things being equal, an un-produced screenplay has a .3 percent chance of being made into a feature film by a studio. But should that screenplay have a solid structure, those numbers might look different.
Why structure? Structure in fiction is necessary for two reasons: As a writer, you need structure so that your stories will “hang together” and make sense. Your readers need structure so that they can understand this story they're reading, and feel something as a result.
This is why I help screenwriters / filmmakers / storytellers to create high-quality scripts by understanding the basic principles, the art of story structure, doubling their success rate when it comes to contests, landing representation, an option, or that .3 percent sale.