Reminds of an research article from Microsoft!. It detailed on why scam emails about `Nigerian prince` are so obviously dumb. The reasoning being it specifically need to target only those who can fall for it. Anything more sophisticated and they would get people who wouldn't fall for scam in subsequent communication.
Except it makes no sense because as a scammer your goal is to get as many people as possible in contact with you so that you can scam them. You can only score on the goals you attempt so cutting out any person, no matter the reason, is illogical.
That's exactly what I was thinking of!