Dont know what Oasis think(im just simple forum moderator, not developer) about this and why dont give packs to all(maybe really cuz they want to stimulate players to create own groups), but... Dont forget, that this packs - just bonus. The main reason to participate - its fun and group points. Oasis can delete GNW packs from game and players still will participate - just cuz its best way to get Group points. Ye, maybe now you dont need so much points, but later if/when we'll have another shop update they'll become very valuable.

Summary: Oasis know about GNW problem and think how to solve it... But I do not know when there will be any results.