Sorry to do this wih my first post, but the reaction is the same as encountered in most security circles (particularly within information security). Since it doesn't directly contribute totheir bottom lines, it's not seen as being important.

Since the radio station appeals to the "green" crowd, the info regarding edible plants will sell, and they know that. The rest of the stuff doesn't have as large of an audience, so it's not as interesting to them.

Bruce Schneiner has a great term for this. Risk threshold.

If someone's risk threshold is more tolerant of being stuck without power for a few days, then they're not going to care about emergency preparedness. It doesn't affect their world view. However, someone for whom the possibility of losing basic services does affect their view will be more apt to take action to reduce their susceptiblity to such an event.

It sucks, but that's how it works, so you need to find and tap I to that risk threshold in order to get their attention, then to show them how whatever it is that you're doing will help to mitigate the threat.