I think you missed the GP's point. Big corporations exhibit almost insatiable greed, and will do just about anything to save money, from H1Bs to outsourcing. Yet they don't hire women more than men. There are two possible explanations:
- They're ignoring their primary driving force—profit—in favor of hiring more men because they incorrectly believe that men are cheaper, when in fact women are.
- Men really are cheaper, in spite of the higher base wages.
In theory, they are both equally plausible. And in practice, that's also true, at least up until the first study was published. But these days, given the sheer number of studies that all say that women are cheaper, you'd expect a significant number of the more forward-thinking execs to take it to heart and hire mostly women as a cost-saving measure. If that is not happening, it suggests the possibility that they have studied those cost differences internally and have come to different conclusions based on more complete information.
The only way to know for sure would be to find an exec willing to disclose a company's own internal studies on the subject, and that's not likely to happen. With that said, the longer we go without corporations deciding to hire more women, the greater the chances that those studies are flawed. After all, the alternative requires us to believe that something matters more to a corporation than money, which for most companies would require an almost unimaginable suspension of disbelief.