Its understandable that there is an attrition rate for female/male instructors before they get to that level of skiing or instructing.
As an example, we are friends with a couple that are both L2 instructors. Both thinking about their L3. If she gets pregnant, he'll go on merrily to get his L3 Pin and likely continue to move up in the ski instruction world, while she'll direct her goals to kids and other such mom aspects. She'll likely continue to instruct and will definitely continue to be passionate about skiing but her emphasis will likely change.
This is not a bad thing, its just something that happens in the flow of life.
Another example of gender and skiing is the unofficial GTG that we had for season end for the shop we work at. Of all the staff, 4 of us showed up for a ski day at Heavenly. I was the only girl. Close to the same ratio of the Tryout list above.
While we were at Heavenly, we met up with a couple other guys -
@Bobalooski @spencer, which threw the ratio more to the male side.
We also met up with
@4ster who was skiing with some other folks - IIRC there were two women in that group with some men (I'm not sure how many of the folks standing there were actually with 4ster's group)
Considering the ratio of female/male skiers who are passionate enough to ski this late in the season, the ratio that made that tryout list is pretty good.