We chose to display the Book of Books separately for this analysis, so it’s not included in the “total value”.
The main reason was that giving it the maximum value of 800K gold and adding it together would distort the comparison excessively. The other rewards have mostly fixed values, so we thought it made sense to separate them.
In the “Where is the gold?” we took the perspective of optimal resources to be earned. So just as we displayed a maximum amount of monthly donations, we also added the maximum value of the Book of Books.