I think the point many are making is the MH-26 charger is now a discontinued product at the UK Nikon store, and there seems to only be some limited stock at some stores and eBay.
To get those extra 2fps how much would the battery grip, battery, charger and battery door all cost? Am I right in thinking the batteries are roughly £169 (
park cameras), MH-26 charger £269 (digital rev), battery chamber door £30. Once you add in the cost of grip which I'm guessing will be over £300, the total cost for everything will be nearly £800 if my maths is right (I'm hoping it's not). The D850 looks a great camera but if Nikon have based the selling point of the 9fps on a discontinued charger that's bit of balls up, unless they think D850 buyers who want the 9fps will already have a D5/D4S/D4 and be able to use the charger that came with it.