Having a combination with your date of birth may be special to certain groups of combination hunters as these dates are special to the individual and only they know the meaning behind that number displaying on their custom number plates. These combinations are a preferred choice to many who like to keep their private registrations private, so the jumble of numbers on the plate are to be known and only known by the person who owns the custom number plates.
These type of combinations tend to be lower in price as demand for random letters and then numbers such as a date of birth or any other special date, is not suitable for everyone.
Investing in specific combinations like date of birth custom number plates should only be invested into if that special combinations means something to you or the person your gifting it to. Or else if intentions are for reselling in hope for a financial gain, the chances of that being possible could very well prove to be very slim.