>>959242791. No qualifications to work elsewhere in the first place (Miyabi...Izuru...Fuma...Rio...) besides, outside of low paying part time jobs nip companies only hire at certain time during the year, even then preferring fresh graduates since they're unlikely to complain about the meat grinder that is japanese work culture. You're kind of fucked if you're older and trying to get a job.
2. Some are already wealthy and are just doing this as side hustle for personal reasons. (Astel, Oga, Temma, Roberu, Shien, Rikka) Not having to handle merch and shit for your side hustle because you're part of a company is a good deal
3.Masochism (Uyu, Aruran)