This is just like a newer version of the Nigerian prince emails, nothing more, nothing less. I just don't get it, it's like if someone on the street asks you to give him $50 telling you he's going to be right back with $100, he just needs to get into his car to get you the money. Would people fall for something like that? At this point I would say yes.
Why did they even tag it "Nigeria Prince Mail" even when the scam is being performed by outsiders? The country's name is still attached to it. That's by the way.
I would say that the main reason is because that email was mentioning a Nigerian prince, so that is the easiest way to refer to that scam. No one is actually going to investigate if the IP address sending the email is from Nigeria or some other country or even continent.