Does the price scale linearly or is there a high barrier to just get any kind of car anyways? If Singapore puts up a high initial barrier, the cost of the car is sort of secondary, or do they also have high import duties and luxury taxes on top of that?
If its just high registration costs, you'd expect to see a lot of higher end cars since there is not much point to pay $50K just to buy a $20K car.
China has high taxes on luxury cars, so they really are 2 or 3X the cost of the states (especially if imported). However, at least outside of Shanghai, registration costs are low (well, in Beijing we have the lottery), so you'll still see a lot of low end Chinese brands flying around.
When I was in Singapore, I got the impression that it was very different there, all the cars were quite nice.