It _has_ to be stupid. A non-scammy-looking scam might attract people who would notice any minor inconsistency, thus risking more reports and more time of the scammer wasted interacting with a potentially-failed prospect.
Now, only the most gullible, most desperate of people would fall into such "obvious" scams, which means a greater return rate for the effort spent.
Now, only the most gullible, most desperate of people would fall into such "obvious" scams, which means a greater return rate for the effort spent.