Never quite understood why people go to the trouble of importing RHD cars that we have here in LHD.
I have the same question.
A few reasons.
First, mileage. Older cars there typically don't have a bazillion KMs.
Second, There can be a substantial savings cost-wise for a JDM (depending on model) vs USDM model with same mileage.
Finally, the car is more than likely in better mechanical condition than a USDM car. Japanese have a very rigorous used car inspection every other year. Japanese term is "Shaken" if you care to read up on it. It is essentially a strict vehicle safety inspection. After the inspection, the required repairs need to be done or no driving it..period. No conditional pass. Fix or don't drive it. So older used cars are typically in a better maintained state.
So these are a few reasons.