That and they have heavily invested with V6 turbo's + twin turbo's, in their customer cars since 2011. I don't think Mercedes will be playing around now that there are more aero restrictions coming in 2014 which should slow down the likes of RBR and McLaren.
The way F1 is going though, the junior formulae will soon have faster cars. All these power drops and aero rules are hurting the sport.
I certainly hope so, I'm with Kyle on this one. I don't like that the speed continues to be limited and innovations continue to be deemed illegal. It hurts the sport, especially when the whole sport is about pushing the boundaries.