Like it or not, the Saint Laurent collection is already one of the most influential of the season. Every magazine is making grunge inspired editorials, stars are wearing it on the red carpet and Zara just copied the whole look. It's an undeniable hit, so the industry in just going with the flow.
I think the reason the magazines are doing so much grunge is because Saint Laurent keeps putting out a million campaigns since Hedi went there, so I think Saint Laurent is quickly becoming the biggest advertiser for the magazines. And it's known that Hedi Slimane has a huge temper and is obsessed with himself, and that the brand is a complete has become a huge PR mess., so these magazines have to appease him. I mean, his collection was like, the only grunge one during fall. Everything else was punk. And it wasn't even the first grunge based collection this year!(DvN Spring 2013) So I think they're just sucking up to him, because he gets what he wants.
I'm sorry but you make no sense whatsoever. Every Saint Laurent advertisement I saw in magazines is the standart double page like all other brands. The fact that Hedi make more images for the campaigns, doesn't mean overload on mazines but diversity of the pictures displayed from magazine to another. And please, the industry is not kindergarten. If they are collectively highlighting his collection it's because the editors feel like it's a relevant message to put in their magazines, also with a connection with the market. You're taking things too personally.