>>12952903Part of Holostars' appeal is that they're the only branch in Holopro who feel like a complete group, their gens don't matter, they don't call each other by senpai and they're always marketed as one entity. Why do you think most of them don't feel like they need new members? It'd be weird at this point, like adding new members to HoloFantasy. Rikka said it might work if it was like a second completely different group.
The problem is branding, not the amount of members. Hololive fans don't overlap with Holostar fans, new members aren't going to attract the attention of brand loyal fans, just Holostar fans.