Is it because nobody can count on their so-called spiritual brothers and sisters to be there for them when things get bad?
IMHO that is it in a nut-shell. In my own case I saw that my parents were kicked to the curb, ridiculed, and ignored entirely by those who for so many years were always there, usually with their hands out claiming, "We looove you," Had it not been for my retirement savings to allow me extended care-giving trips, and a very kind DF'd family member who lovingly gave me relief breaks every couple weeks caring for my parents in their final few years they would have had no one. Not one single person from their congregation could be bothered to do anything other than tell me that I should put them in a home somewhere! Sorry (expletives deleted).