Given that the 6 Cyl Series is the 3rd series in the Amateur Level, what is the logic of introducing a car like the Nissan GT-R with a PR of 2.5, given that a player who reaches this level has already had the option to buy cars like the BMW 1 (PR 18) and the 350Z (PR 8, upgradable to 21)?  At this point I don't use some of the 8 cars I already own; like the the Hyundai & the Focus.  Why on earth would I need a GT-R?