This one isn't so much a cultural conundrum as it is a cultural convenience.
The delivery person rides around on a scooter. I've also seen a KFC delivery person riding around.
I'm not sure how much extra it costs to have your food delivered. I have yet to eat fast food during my stay here. It's tempting to have a taste of home every once in a while, but I figure fasting from McDonald's and KFC for five months will make them taste that much better when I return to the U.S.
We'll see how I hold up.