That doesn’t make very much sense.
Yes, the board members who are into Effective Altruism are undoubtedly a piece of the puzzle. But everything you outline isn’t just common corporate knowledge, it’s basically well-documented public record.
And remember that this is a Board that Altman effectively hand-picked. He did not appoint a host of dum-dums to oversee him.
Whatever happened, there is waaaay more to this than anyone has been told. At this point it’s all speculation, but I think it’s pretty safe to assume it’s not just a case of “we didn’t know it was expensive” or “we didn’t know how popular Sam was”.