I have a notion that the PtB were higher beings who had their own ultimate agenda or goal that they were pursuing, and Angel, Cordelia, Jasmine, etc. were small threads that were interwoven into that ultimate end. I can't remember now if I got that idea from AtS or in a previous discussion with
@thrasherpix. But what those ultimate goals are, I can't guess. "Mysterious ways" and all that!
It seemed that while initially they acted with benevolence, in the end they just used people as pawns to set in place for some endgame that only they knew. The Jasmine arc was an example of this mysterious endgame, but itself only a part of the Big Picture.
In other words, it was a mistake on Angel and co's part to think that the PtB cared what happened to them. They were willing to act on behalf of Angel, or even W&H, as long as it didn't interfere with their own plans. But you could never know if they had a hidden agenda about what wishes they granted. If I had to guess at their goal, I would say it was to create some perfect world for themselves, which may or may not be to the benefit of (other) gods, demons, or humans.