I was flipping through my copy of
Superhero Comics of the Golden Age: The Illustrated History by Mike Benton and came across some info related to this thread.
Fox Publishing"Kirby was paid a "fifteen-dollar-a-week salary".
Editor-in-chief Joe Simon got "eighty-five dollars per week".
Binder StudioPaid artists between "75 cents and $1.25 per page". However this was an assembly line process with different artists handling different aspects of the production process: "roughs, pencils (background, secondary figures, and main figures), inking (background, secondary figures, and main figures), and lettering." for "a cost of eight dollars a page."
Writer Otto Binder got "two dollars a page in 1939. By 1941, he was up to three dollars a page".
FawcettBefore they started publishing comics CC Beck land an illustrator job "He was paid a salary of fifty-five dollars every two weeks to do the jobs of two artists he replaced".
Funnies, IncorporatedWriter Mickey Spillane was paid "almost as much money as the artists". (I couldn't see a rate for the artists, though.)
GeneralWriter Otto Binder recalled page rates shooting up through the war to a standard "ten dollars a page." ("The Golden Rut".

)
Writer William Woolfolk was the highest paid writer in the 1940s "I made $15,000 a year when people were making $1,000." Of course he liked to work for four different publishers at any given time.
Woolfolk also recalled that right before the war ended comics "were selling 102 percent; that is, they were selling beyond the spoilage rate."
Newsweek estimated that in 1943 comic sales "added up close to $30,000,000."