>>61101762You probably won't get any good answer for this because no one (outside of Hololive) knows.
Chances are they don't, though, because Fauna once said that it's rare for merch outside of birthdays and anniversaries to go above SC (in term of cuts, not their income) and their SC cut with Cover is 50:50 of net revenue too (35% of gross since YT takes 30%).
Still, they should still get decent from generic merch given that Coco said majority of their income comes from merchs when she was still the worldwide SC queen