The examples op gave....
It's obvious that stayc comes from the least privilege background and have no big hits. They just have songs that did mid in performance be it in Korea or international.
Le Sserafim has two solid sellers from izone and they are a hybe group
Kep1er a mnet gg
Aespa and ive both got hits way bigger than any stayc song. Also again one is a SM gg and the other has popular izone members.
Big3 ggs need no hit to sell lol. They got pre made fandom