I don't believe that money actually is a driving force in this. The biggie (and the very *big* biggie) was going public in the first place by all of the people involved with the War of the Wales era. It gave the tabloids a fortune and everyone involved (excluding Camilla) had their say somehow and someway in the media. Just about all of the cast of characters of that war were guilty of letting each other down.
As Charles stated around that time, "They've turned us into a bloody soap opera!" That statement, to me, is the whole ball of wax in a nutshell.
BTW: Just because I could, I ordered Pasternak's book. Its one I've not read yet. Not bad for the price of a Starbuck's coffee.