[HumanOstrich]

Maintaining a fast food habit is both expensive and non-trivial. For the people who have to drive to get their fast food, at least you know they are capable of learning something more complex than cooking.

[inglor_cz]

OK, so how do you explain that people don't cook, especially the ones who are relatively poor and could save some money doing so?

I have been engaging in this thread for a day now and harvesting downvotes. I would certainly love to see some competing theories and dig into them instead.

[johnisgood]

I mean, how do we explain the fact that in the US homeless people have access to expensive drugs? :P