I saw that up there. I assume they have preppers who go all out?
It's mostly people who think they know what disaster is going to happen (flooding, civil unrest, earthquake) and then try to take precautions. The problem is, you can easily tell it's fake. Yes these people believe they are prepping for the end of times, but then some TV producers come in and basically make it a farce.
Don't get me wrong, the people on the show have issues. They are paranoid and they actually want "the end" to come because they can't function in every day society. But you can see they are being exploited by the show.
Also, I do think it is smart to have a plan and supplies for disasters. But these people are on another level.