Alaska Division of Elections use to purge their voter database every two years.  If you don't vote at least once out of the two years you're purged out of the system.  It's no longer a one time voter registration system.  I don't think voter registration should be linked to the PFD.  We always read about people frauding the PFD.  I can imagine adults using their children's names to vote more than one time.  There's always room for abuse.