Breakfast is psychologically interesting. People have strong feelings about it, which may not match their feelings about any other meal. I think it's almost always, to some extent, comfort food -- if you're having a hot meal then it's fatty and salty and filling, and we very rarely stray from the five or six different things we learned were "breakfast" foods when we were kids.

Breakfast is intrinsically pretty unadventurous. Eating something that isn't a "breakfast" food is impossibly daring. Spending more than twenty dollars is impossibly extravagant.