@Carla: "I really don't get why someone need to be 'approved' to stand around a cart and have people walk by and ignore you." That's a perfectly valid point you've raised from a non-indoctrinated perspective.
@john.prestor Your theory on their vulnerability to apostates is a good one. I've also thought about this and believe some of it has to do with Watchtower's degrading technique of classing otherwise menial things as "privileges". Check out this post to see what I mean: https://www.jehovahs-witness.com/topic/5934430200791040/unprivileged