>>33684213The hololive fanbase is 80-90% maidenless foreveralone weebs, and they are mostly 16-25 years old, interested in anime, and like to play around with the idea that they are the MC. They are the basis of this e-thot industry.
The male vtubers are watched or subscribed to by the remaining 10% Whether their character is BFE or Brotuber, this is the fan base available to them in the hololive zoo.
The girls have a huge advantage with the softcore hentai, but once you get tired of it and want new meat to jerk off to, their viewership fades.
By making her stream entertaining because she's doing a collab with someone whose only skill is to entertain, she can get some buff before she gets boring again. Plus, the brotuber isn't threatening to steal her views.
The only problem is if the girl is unprofessional and makes her fans jealous, who are antisocial by default. Then the girl's more parasocial fans flip the table, shit themselves furiously, and scream at the top of their voices how dare their virtual onahole cheat on them..