I still don't think it's reasonable to say that "I have a hard time believing anyone would fall for a Nigerian scam." Enough people do it to make it hugely profitable for the scammers.

And falling for a Nigerian scam requires a much higher level of gullibility and a higher level of buy-in from the victim than merely letting somebody else set your expectations with careful phrasing.

My point isn't that everyone would fall for it, but if there are enough people who fall for more blatant scams that you can build a hugely profitable business off them, there's certainly a considerable number who would fall for this.