Could this be why there is a reluctance on the part of some to register there cars?
I don't believe so. I think it is more privacy concerns on the part of the new owner and also the "What's In It For Me?" factor.
If the owner of a vehicle does not want the services of a Register, what incentive do they have to bother?
I know MANY "collectors" (or accumulators really....) that do not properly register their vehicles with the government and do not even change the TITLE of the vehicle over to themselves!
There is a paranoid thread that runs through many people about letting other organizations know what items you own for the fear that somehow, someway this information will be used against you.