Via TechDirt, from Things with Wings Clear Shuts Down Registered Traveler Lanes
"The pilot program was rolled out with great fanfare July 18, 2005, in Orlando. Travelers initially paid $99 a year for a card that was supposed to target those who posed a minimum security risk, and give them a special line that would process them through airport security more quickly."
These were the equivalent of HOT lanes for airport security. They have failed in the marketplace, people will only pay so much for queue jumping.