I'm not a prepper, but it certainly wouldn't help to have a nice cache of stuff in case anything happens, whether it's 'Apocolyptan' or not (even though I don't).
But if you have a big stash, don't let anybody know about it because if there is some horrible event, you will be the first to die if they know about it.
Reminds me of the Twilight Zone episode about the guy with the only fallout shelter in his neighborhood.