warning: contains assumptions without backing facts
I reckon they chose ladies because women buy items more based on emotion rather than looking at the technical side of things. Eg, when i buy a car i look, is it reliable, economical, comfortable, fast and all that sort of thing but when my sister was offered a car (FOR FREE) by my parents she didnt want it. It was all of the above but it was mushroom brown in colour and didnt have a good stereo.
Macs have a definite benefit in this way, they are seen as cool and look pretty damn good, something which pc makers tend to struggle with so resort to neon lights and stickers. Microsoft is trying to convince the potential switchers that they are going to be ripped off, and they are doing this by making quite blatently inaccurate statements about computers without looking at things quantitively and then going on to say that because the pc worked out cheaper (initially) then it must be better for the person
I hate the latest advert because it says that the normal macbook costs $2000, (I hope M$ gets their arse kicked for this). All the adverts tend to ignore that the pc laptops are generally massive, heavy, poor battery life and are designed to break in 3 years and they dont go to any effort of describing the advantages of the mac laptops (think about the video editing girl, who didnt pick the macbook pro cause it had 2gb of ram instead of the 4gb that windows could only use 3gb of l0l)
anyway ive wasted enough study time on this post so ill let other people debate the topic.