The argument that there should be a 'men only' event as a counterpoint to the Ladies Event is missing the point of why the event has been created.
I don't believe that women face insurmountable discrimination in Poker rooms. They are a few knob jockeys at the cash games and a handful of bigots across a whole tournament, but for the most part, people playing the WSOP are just happy to keep their head down and play their game.
Rather, the Ladies Event exists to promote and advance the participation of women in our community. Poker is a mind game and can be competed on at an equal level by people of any gender, sex or ethnicity. Women are a minority only because they have not been as exposed to the game. Historically, there have been few opportunities for women to pariticpate in what has (since post WW2) been a regular 'male evening' across America and Europe.
Poker sites are showing much greater awareness of women as an untapped market of clients. Pokerstars Women exists to appeal to the half of the population who might have learned the game over men's shoulders, but never had the chance to compete. I believe this department is doing a better job at promoting the game than any other. This recent article
does well to point out when women excel in the game, their achievement should be lauded louder - not because it is a triumph against adversity, rather, simply because by nature of the percentages, they are significantly rarer.