Sales of Superman and the Superman Related comics went through the roof from the late 50's, when Weisinger took over, until the mid Sixties,when the Marvel Revolution hit.
I'm curious what your source is for that claim.
"Went through the roof" implies the sales figures went up dramatically in the late '50s. I am not aware of any figures which back up that claim. Yes, Superman was one of DC's best-selling comics in the 1960s. It was also one of DC's best-selling comics in the 1950s and the 1940s.
The Superman comics carried circulation figures once a year starting in 1960; these figures were not published in the comics in the 1950s.
Here are the official sales figures for the top-selling comics of the 1960s. Superman, as you can see, sold quite well -- although less than his over-a-million sales back in the 1940s, and less than the two top Disney comics.
And
here are the official Superman sales figures for all the years they are currently known.
A number of comics companies were hurt badly by Wertham's crusade, by Kefauver's senate hearings, and by the introduction of the comics code. Other companies (such as Archie and Dell) appear to have benefitted, since when the horror comics were squeezed out that left them with more market share. Is there any evidence that sales on Superman comics went down, rather than staying fairly constant?
Superman appears to have been doing well enough in the late '40s and early '50s that DC was interested in spinning him off into other books.
Superboy got his own comic in 1949; in late 1953 DC increased the frequency of publication, from bi-monthly to 8-times-a-year, indicating sales were increasing rather than decreasing.
Jimmy Olsen got his own comic in 1954, again starting as a bi-monthly; DC upped the frequency of this book in mid-1955, again indicating the book was doing well.
Lois Lane got her own comic in 1958, starting bi-monthly; frequence was upped in early 1959. Looks to me like sales of Superman comics must have been doing pretty well all along, or DC wouldn't have kept adding Superman books and upping their frequency.
Meanwhile, other editors at DC were also adding new books (and upping the frequency on the successful ones): the new
Flash gets his own book in 1959, frequency is upped in mid-1960;
Green Lantern gets his own book in 1960, frequency is upped in early '62; the Justice League of America got their own book in late 1960, with frequency upped in early 1962; etc.
Yes, the Superman books sold better than the new Flash and new Green Lantern. That's because Superman had been around for 20 years, was known by virtually everybody, and appeared in his own prime-time tv show from 1952 through 1958.
Weisinger deserves credit for keeping Superman's sales good. But it's not as if he took over a book with low sales and turned it into a best-seller. He took over a book with good sales, and he kept them good.
But, yes, Weisinger did pitch Supes to a very young audience, whereas the rest of the DC comics appealed to a slightly older audience in the 12 to 14 age group.
The stories appearing in Superman during the late '40s, early '50s, late '50s, and early '60s are all aimed at essentially the same age group. There is no sudden change that I can see at any point during that time in the nature of the stories or the age group being aimed at.
Harvey books, such as
Casper the Friendly Ghost, were aimed at a young age group; Superman was aimed at a slightly older age group -- the same basic age group as the other superhero, science fiction, western and war comics DC was publishing.
Marvel was outselling DC,and Supes, despite attempts to make the character appeal to a more mature audience (With what Kirby did with Supes in "Jimmy Olsen" and "The FOrever People" and Dennis O Neill's run as editor, which consisted in trying to undo a lot of Weisinger had done) was dropping in sales...
When do you think that Denny O'Neil was editor of Superman? He
wrote Superman in the early 70s under the editorship of Julius Schwartz; perhaps that's what you're thinking of. (He did briefly edit Wonder Woman, in the early '70s, and The Shadow a little later. And he edited the Batman books in the '80s. But Superman? Not that I know of.)