I've noticed this in our congregation, that a lot of brothers who start of pioneering in their mid to late teens, stop shortly after they get married. Maybe they think it's a sister thing.
Also, a lot of the friends in the hall who have been to Pioneer School, are no longer pioneers. This seems to be more for the younger JW's, than the older, retired JW's who have nothing else to do.
Has this been your experience?
Also, if you went to Pioneer School, how long was it before you came off the list? How many of your friends stopped Pioneering?