I would imagine that there aren't hordes of females applying for jobs in games workshop TBH, rather than it being a sexist conspiracy.
I happen to know that the Games Worshop inhouse professional painters (ie very important and always featured in the montly magazine) we until recently 2 women out of a team of 6, now there is one. I have been to a convention about this sort of thing (don't ask) and while walking around commented to DH that I couldn't think of another situation where I could be in a situation so predominantly male and feel so totally relaxed. And there was a dalek!
From personal experience I also think that men and boys who are into this sort of thing (fantasy/sci-fi and sciencey types) are in general the least sexist men I have met.
So while I can see the point about yes it's all male figures, and the men in the shops are, well, men, and the customers are all male.... i don't personally think it's a cause for concern. I have never felt unwelcome in a games workshop shop, which I have done very much in some otehr "male" environments over the years.
The women figures being scantily clad... Well yes OK I'l give you that. I can't see much wrong with the attire of the woman in the first pic you linked to though... And again, in fantasy worlds female charaters are just as hard as the male ones.
I can't get worked up about this one, sorry 
PLUS do we really want equal men/women in all shops? I don't want men flogging me knickers in john lewis. Maybe it is nice for boys to have somewhere to go where there are good older male role models for them? People are always saying that boys don't have enough male role models in their lives...