Screenwriting : How is screenwriting like cooking with salt? by Diana Amsterdam

You can always add more but you can never take away. When you bulk up your screenplay with complicated scenes, numerous locations, a huge cast of characters, special effects, bridges, planes, babies, whales and/or volcanoes, you put a BIG price tag on the making of it, and most films that get made today are in the low to mid-budget range. Why, even superhero films are getting made for less at Warner Bros these days! So while I know it's jazzing to write whatever your imagination conceives, if you can keep your locations, characters and scene changes to a minimum, you have a better chance of attracting money and producers. Think horror films--this doesn't have to be your genre, but they are traditionally among the most inexpensive films to make, because a lot of the action takes place in just a few locations.