I think because being in the Borg was so soul destroying the thought of a huge reward in the future kept you going from door to door.
Mind you we have just moved to Wales with a huge JW following and I cannot grasp how many are living in expensive houses. I would have thought they would be glad to sell them for the 'kingdom interests'. I found out the house we bought belonged to a JW family for 100 years. Not investigated the loft yet, who knows what we will find? Lol....the seller told us how they had found their dads brewing kit in the old shed, they did not know our JW status!