At the local level the rank and file are told that it is a loving arrangement to collect lost sheep, the elders are told to do it because it's part of their job (see? even when your working your way up the Dub ladder you have no additional freedom; in fact the oppression gets worse in exchange for a little power).
The Borg motive? If they're calling on faders, you're cleaning up loose ends. They either get them back or find a way to get them DFd. If they're calling on DFd, they're trying to ascertain your level of influence among the current Dubs, if any, and evaluate the possibility of re-recruitment or whether they should take steps to further marginalize you from congregation members.
At no time does ANY of this actually HELP ANYone.