Has nothing to do with people who switch their culti.
More for the newbies who need to get their Morai skills.
...Correct me if i'm wrong, but isn't the only way to get Morai books by... doing Morai? If so it makes no sense to make a pack. For starters, no one sells books, it's all either from the forge or from the boutique, so it has a set market value, even though it's never sold for that exact reason.
Morai books however are only obtainable by farming and thus have no set value? Also, each book is 300 ec, I seriously doubt any newbie who needs to get their Morai skills will readily have 900 ec (more if basic skills included).