I think you've got the order of things mixed up. No company intentionally wants to cut their customer base in half. They've tried to attract female readers. They'd be stupid not to! Women just aren't attracted to comic books.
And don't forget that comics _used_ to be sold in book stores, gas stations, etc. Now they aren't. You know why? Because across the board hardly anyone, relatively speaking, reads comic books. They're niche because they're just not that popular in general.
> ... in the US. Unsurprisingly, given that they mostly sell products not targeting women... in the US.
Because in the US, women don't care about comic books. It's a chicken and egg debate for the ages, clearly.