I think it's important to want to support women in tech for non-selfish reasons too. The idea that half the people in the world don't feel like they can pursue hacking because of unrelated issues is not acceptable.

Still, I agree with your self-interest arguments and would even add another:

I am tired of only ever working around guys all day. It has been long time since I worked with any non-guy low-level coders. Heck, bring in some transsexuals, either direction, I don't care. Just mix it up a bit. An all-male work environment becomes tedious after a while.