Have to say that your theory seems shortsighted to me and does not apply to top performers of either genders, especially if you look at professional environment. I have met quite a few women who go into certain educational path to meet partners (medical school is a good example), but they are not passionate about the field and therefore, never become the top performers.
On the other hand, if you look at top performing women in startups, they are passionate about their work and are not there to find partners.
A startup should hire talent regardless of their gender... being a woman myself in the tech field, I dont want to be hired because a startup is trying to cultivate a 'enjoyable' work environment. Its about who brings the chops to the table.