The CS does not come with Carbon Ceramic Brakes either. The DCT and the headlamps would take an M4 Comp Pack to $80,000, both cars have M adaptive suspension etc. So if it lands at $100,000 that equates roughly to $20,000 (a 25% hike) for OLED tail-lights, unique front splitter, unique gurney flap, unique interior, some unique paint options, a (technically unique but not really) wheel design, a GTS style CFRP bonnet, GTS style diffuser, 50 Nm torque increase, 10 hp power increase and 35kg weight decrease.
Rewind to 1990 and you might be wrestling with a similar dilemma over the E30 M3 Sport Evo.