Even if we were to take the most cynical view that all CEOs and managers of vtuber agencies are cold-hearted, self-interested bastards with no moral values and were incapable of any sort of friendship, it would still be in their best interest to look after their talents. Talents that are looked after means lower talent turnover, they're working harder and dedicating more time and effort to you, talents that are looked after mean the fanbase is happy and giving you money. Oh, and you're more likely to attract better talents in the future.