The sci-fi, supernatural genre has a more selective appeal,

Women watch more television than men in general, ... So it kind of makes sense to come up with programming that attracts the viewers most likely to be watching.

I think 'Desperate Housewives' whetted the appetite for 'Sex and the City' refugees.

Moderate successes are good, because if they do better than the shows they replaced, it's still a success for the networks.

We say it’s a modern American Western - two gunslingers who ride into town, fight the bad guys, kiss the girl and ride out into the sunset again. And we were always talking from the very beginning that if you’re going to have cowboys, they need a trusty horse.
—Eric Kripke on the decision to add the Impala

His demonstration that lightning was not supernatural had huge impact.