Fish pays for all their official art, rigging and models, production related to all songs and covers, at least some games, gym memberships and some of them are trying to get him to do corpo health insurance too. He might actually do it.
Not even the big corpos pay for songs and covers unless its a part of a sponsorship or live event.
And the girls have said before voicepacks have the smallest cut to the fish, followed by merch which might depend on the novelty of manufacturing or being a rebrand of a product.