Right, and if their CFP is systematically discouraging some people from applying, or their review process is systematically undervaluing proposals from some people, and those people would give great presentations, then the conference is not going to be as good as it otherwise would be. Conferences that fail to take questions of gender representation seriously are depriving their attendees of great presentations from women. If you care about the quality of technical conferences, you should want to attend those which have a policy that tries to ensure good proposals won't be missed simply because of the gender of the presenter.