They just make shit up so that they sound smart. people with functioning brains realize it makes no sense and stay away (this is good for the scammer because they don't want smart people asking questions/holding them accountable). Idiots are to embarrassed to question these things because they don't want it to look like they don't understand, and they are perfect marks for the scammers. That's why nigerian scammers put in the typos. It's not because they're idiots, they're narrowing down their target pool.