There are a lot of similar groups e.g. for Music. Within that group you get choice of avatar titles and notices of performances. There are so many groups you needs alts to hold group membership for you. Since the functionality is basically the same across the individual groups, they could subscribe to a Supergroup that offered avatar titles and notices on all its children groups. An avatar need only be subscribed to that Supergroup to be able to handle 25 current ones.