used car dealer will find you THOUSAND excuse for you car, be it plate or bla bla bla bla ...... when they start selling it, they give buyer another thousand reason why that car worth (include plate).

for example :
Seller P plate, Penang, so close to sea, sure rust la .... road condition there so bad, mounting, absober sure die la ..... bla bla bla
Buyer : Penang car is good, low mileage, you see Island so small, even every day round island mileage will be lower than KL car la .... bla bla bla 

But some sohai really believe in it ...

Sabah people usually skeptical when buying car with Peninsular plate number.

That's why most Sabahan(including me) in Klang Valley will get Sabah plate number if they had plan to transport the car back to Sabah in near future.