The portrait that it painted of the average mainstream comic book reader is as follows:
Male, 20-25, video-game player, disposable income, "techie," single.
What is the breakdown of male versus female readership?
More than 90% of the readers of mainstream superhero comics are male.
This doesn't match up with my experience when I go to my local comic store (not as often since I went to mail order DCBS). At Tate's Comics, there are always women, and it seems about ~25%, but maybe they are an outlier? Other stores I have been to have had much more stereotypical demographics, right down to Comic Book Guy being behind the counter.