Why has there not been a spin off series?

There is plenty of content/mysteries/material out there to generate a massive Universe of content but how comes ABC has never capitalized on this.

I personally would like to see a series based on the off Island others post 2008 (like Bens Lawyer and the Lady at the meat store) with Richard & Miles involved. How do people off Island go about their daily lives knowing how important the place is to the World in general. maybe even throw in a Sawyer cameo or 2 aswell.