Interestingly enough. I was at the Easter Seals Ride-In in Gorham about a month ago. I attended the auction at the T&C on that Saturday night.
One of the item that was raffled off by the NHF&G was a "Zero Registration".
The winning bidder got the registration number "0000" for the next season (as well as a certificate and bragging rights). I do not recall the final winning bid but I do know it was closer to $1500 than it was to $1000.
Perhaps F&G will go for Vanity Reg #'s next
FWIW, Belmont Bogie Busters have outbid everyone for that Reg number every year except the first year since its inception. (per the auctioneer) (I am not affiliated with Belmont Bogie Busters)