I also want to point out that the objective of alliance games is to pit alliances against each other, and if the opposing alliance wants to surrender, then I would consider that a fulfillment of the initial goal. With that in mind, perhaps it calls into question why 1500pts or any arbitrary number, which is only indicative of performance relative to the rest of the map, is used to end alliance games. (Although this is probably a whole other discussion) If domination maps have an unique objective of capturing a number of "flags"/provinces, I don't see why alliance games can't.