>While Nigeria is most often the nation referred to in these scams, they may originate in other nations as well. For example, in 2006, 61% of Internet criminals were traced to locations in the United States, while 16% were traced to the United Kingdom and 6% to locations in Nigeria.[15]
Err, the author actually WENT to Nigeria to meet her actual Nigerian scammer -- and others doing the same. What stereotype? She doesn't say that most Nigerians or only Nigerians do such things -- but that's what happened to her.
https://www.microsoft.com/en-us/research/wp-content/uploads/...
Those who've been in the game for a while, have the ability to collect money from any country the "victim" feels comfortable sending money to.
Also, about the intentional grammatical error. It's not intentional. Many of them aren't educated. In fact, most learn to use the computer and internet on the job.
To take advantage of the dissuasive effect of saying you are from Nigeria, you don't necessarily have to actually be in Nigeria.