I loved seeing those ads in vintage Archie comics ('60s-'80s editions). Those ads wouldn't bother including a photo, but usually had a nicely drawn artist's rendering. That to me spelled a certain kind of commitment to the scam. Today, all they'd have to do is select the right demographic on FB ads (usually people who "also express interest in" IQ pills or some other snake oil), and click a button to put the text-only ad live.

Maybe add a bad Photoshop image if you're feeling creative.