The economy is likely playing into a lot of it too. There's enough truth in a lot of the conspiracy topics to make it easier to validate some of the more extreme views. For example, the government is controlled by money and elite corporate organizations. Whether or not these people belong to the "Illuminati" isn't really the point. There's also a big difference between storing up a supply of food, water, and emergency supplies for a possible economic collapse (which is actually a good thing to do even without a collapse due to all the weather emergencies that could knock out power and distribution channels for weeks) and building a tinfoil pyramid in the backyard with a huge sign made of flares in preparation for the Zyngoidian invasion which will be led by Obama, who is a Zyngoidian in secret, of course.
I just don't really think we have enough information here to judge whether this man really has a serious problem, or if it's more a matter of him passionately enjoying a hobby/topic that his wife doesn't share. For all we know, he could be on a different forum making similar complaints.