... and that reason is that they were tested infinitely.
What you see in an old ad is the perfect combination of words, evolved over a long time, which can be hard or impossible to come up with in one sitting.
Example:
Yesterday I wrote an email to my list with the subject line:
That subject line (and the entire email) are modeled on this ad:
And when I say "modeled," I mean I used a bunch of the same words, same arguments, same structure.
Results so far:
55 replies, many from people who are surprisingly qualified and serious about the offer.
Would I have gotten the same kinds of results had I simply used my own copywriting brain to write this email?
Maybe.... but my personal guess is no.
I've had this experience before when I modeled old ads.
Completely outsized response to what I normally get.
I know it's familiar advice but it's worth repeating.
Study old ads. And don't just study them. Apply them. Model them. Even word for word.
Old ads are a treasure chest waiting to be opened, and the fact that the treasure chest has been sitting in an attic for the past 100 years doesn't change that.