Its probably a wide spread issue, I expect lots of boaters have never heard of a CG66 form. The only time I heard about a CG66 form was on a training course. So considering many people dont take training courses there are probably huge numbers of people without a VHF licence and without a CG66 form with the coastguard.
I do have an Icom VHF set I took off recently and replaced with a newer set, the old set still works and I am going to sell it, however its sat in my garage because I am conscious it still has my MMSI programmed into it which I need to get taken out before I sell it.
I blame the manuafacturers, there should be some mechanism by which a normal person can reset the number rather than haveing to take it to a dealer to be done.
Here's an idea, maybe the manufacturers of the sets should give the necessary resetting equipement to all the local RNLI stations around the country and they could offer a service to reset the number free of charge but with the condition that to do it you must A - show a valid VHF licence and B - Show a valid CG66 form completed or fill one in if you dont have one.
Or perhaps chandlers should do it, I dont know why a charge is made to reset them.