Is it not the same with anything like this though? Why is an import worth less than a UK model........not really any proper explanation other than it just 'is'.
Maybe it was owned by the Jap Stig or maybe it was wiped with a diaper for the first 5 years of its life.
Maybe a car was stolen by a smack rat, thrashed, smashed into kerbs, filled with normal unleaded (the horror!) or maybe it was stolen by a professional car theif parked in a heated garage whilst waiting for George Adedguengo to come and pick it up.
One doesn't know so it leaves an element of uncertainty.........therefore its worth less.
Problem is if you apply these theories to normal UK car's you'd never buy a car again because lets face it if Zeds are in the price range where scrotters and 19 year olds can afford them then anything can happen........not to mention the people who are rich enough to own one and not give a @*!# so they thrash the balls off it and couldn't care less.
In summary..........its worth less just 'because'. Provided you payless and expect to sell for less who cares.