I'm comparing a supersport to a sport car... Notice the mazda 3?
Going by
rock bottom trademe prices cars are cheaper, mainly because the market is flooded with them. However a $500 mid nineties car isn't going to win many crash tests, which is why NZ stopped importing pre 1995 japanese cars. My car was $600 and my bike was over 2g so I won't argue with you on that

However once you start looking up around 7k or more bikes rapidly become better bang for buck, depending of course on what you want them for... Upgrades on bikes are also cheaper than upgrades for cars. And no sound system to worry about!
Going on safety, older cars are less safe but cheaper than bikes, nineties cars are fairly reliable. But a big job on a bike does not cost the same as a big job on a car. Our subaru can attest to that. Essentially bike ongoing costs are certain, whereas if your lucky a car can give you thousands of miles of grief free tedium. Or it can cost a bomb. Buying a new car gets rid of the worries of buying a lemon but at the expense of costing 10X more than a used bike. Sliding scale of course.
Your average bike is cheaper than your average car, on the basis that your average NZ'er doesn't drive a $500 car.
EDIT:
A thought. At rock bottom prices petrol becomes a big factor, a years petrol probably costs more than your $500 car. But then Rego costs less.
There are many factors here, and each price bracket has a different answer, so I guess what i'm saying is it's nothing as simple as saying 'cars are cheaper'.
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