Cars and colours? To me the popular and desirable colours are the ones you see the most of. If JCB-yellow, jaffa-orange and twyfords-white were so desirable you would see more cars that clour on the road.....or am I thnking to hard.
When the car does end up on the secondhand market rare colours lower the value and make it difficult to sell, unless of course its on some exotica. Say in 3 years time you wanted a used GP, you had the choice of New orleans blue or twyfords-white, what would most people go for??? You may go for the white because you think you are getting something special but the other 99% who dont give a sh** will go for the blue because its a far more appealing colour. Then the white becomes more difficult to sell and its value drops.