Thanks for the clarification.... However you and I both know that any plate is only worth what someone will pay for it, however like many commodities that have no use, there will always be someone who will pay for the perceived prestige of individuality. So no I'm not saying that a plate off an old car is worthless, but other than the way that a reg plate identifies a motor car, it is pretty pointless.
all my company vehicles have "private" plates, they either say the name of the company or have a connection with the company's work
gimicky yes, but people notice and remember
another scenario is when someone says they saw a plate on a car, they then name the car and its plate, whereas with an ordinary plate they only ever recite the car