A more likely reason why DC and Marvel won't really go after more female audience

This posting on Comics Beat gives some reasons why the Big Two aren't trying to go after female readers. There's some good points to be made, but I can think of a better one: It's because the female audience most likely to try out any of their books would want the stories to be stand-alone, present plausible characterization and continuity, and the Big Two in their current state would rather