If Selen, a vtuber with a fraction of their views, could clear 200k/yr at a company with notoriously bad payouts, it should be safe to assume HoloEN's members earn an absolutely ludicrous amount of money, easily in the mid-six figures if not higher for some.
Additionally, the girls must be extremely cognizant of how ephemeral vtuber careers are, with some of them (like Mori) taking full advantage of the opportunity despite a dwindling viewership. It is puzzling to me that, under these circumstances, anybody would voluntarily pause their activities for extended and repeated periods of time. Just what is so hard about being in Hololive?