I guess an incentive for a new car - apart from the 'newness' of it - is the warrenty that ensures you can get its glitches in the first six - twelve months ironed out easily and at no cost.
I balance that against the fact that if I buy a car one - two years old, the major depreciation has occured, and someone else has endured the hassle of fixing its glitches for me.
Personally, I don't harbour a desire for a brand new car - I am content with one that goes.
For my next car, i want a yellow Fiat Sport, and a 'used' one will be fine.