Sydney show special: The ultimate G Class

I've been a fan of the Mercedes G-Wagen, now the G Class, since driving one bought in for evaluation by the army as a Land Rover replacement. A few have come in for civilian owners, either as private imports or special orders from the factory and now, it's being introduced to Australian buyers in five-seat wagon configuration. The G 350 BlueTEC  uses technology to reduce diesel emissions, especially nitrogen oxide (NOx) emissions, but forget about that. The G 55 AMG, pictured, is the ultimate G Class, with an $A215,000 price tag and a 5.5 litre V8 supercharged engine developing 373kW and 700Nm of torque between 2750 and 4000rpm. It will do 0 to 100km/h in 5.5 seconds.
The interior is uber-luxurious, but I can't quite figure why someone would want to pay that kind of money for a fast box that they'll never use off-road, where it excels.