It does seem like it slows down the higher ap you get. I think they should bump it up 4x in angel clan temple/church and 3x in the regular churches and also allow you to give food items to other players and you gain an ap point for doing it. Or at least 3x in angel clan church and leave the others at 2x.
other possible ways that could be added to gain ap:
1. get married gain 5 ap and getting divorced you loose 5 ap
2.eating food gains 1 ap per item ate can only consume so many items in a 12 hour period- drinking beer loses 1 ap per beer.
3. get 1 ap point per bug turned into the witch.