Do you keep spare files lying around with discarded paragraphs like film on the cutting room floor? How do you feel about writing paragraphs worth of stuff and then scrapping it?
I don't mind scrapping stuff that clearly won't work, but I prefer to try to find ways to rework failed ideas and turn them into new stories. Sometimes I take something that may have begun life as a literary tale and tweak it into a pulp story. Or perhaps transmute a sci-fi story into a horror tale. Sometimes the new settings don't fit, but you'd be surprised how often they do, and -- voila! -- I've got a brand new story from the bones of a dead one.
And that's a zombie I'll welcome into my life any day.