Just because a scammer is stupid does not make him less of a scammer. It makes it less likely that people will fall for it. But even scammers more sophisticated than this one play with the big numbers, they know that they will only be able to scam a very few people but only with those few will it be profitable for them. There is always someone clueless or naive that can fall for it.
Yes, I agree with you, but it would be wrong to call scammers stupid these days because scammers these days are so talented that you will always be defeated by their talent. They trap you in such a way that there is no way to understand it. Now it is not the old days when we can say that scammers are stupid. Their tricks are now very dangerous which we do not understand, so we should be careful. Do you think scammers of today are stupid?