I've often considered creating a male pen name for myself. Nothing new for me, I always wanted to be a boy when I was growing up. Why? I got tired of being told that climbing trees wasn't lady-like. As for the male pen name, I thought maybe that might help to crack a few markets I'd like to see my work published in. And yes, for whatever reason, there does seem to be a bit of a boy's club out there. It is changing, but so does sand on the desert. One grain at a time.
Of course creating a new writing persona can be quite complicated as explained in this thought provoking essay http://www.booklifenow.com/2012/06/whats-in-a-name/