Nice one, The Source - although the 'big three license fee' shouldn't be zero for digital distribution - MS/Sony/Ninty/Valve will take a cut if you sell on XBLA/PSN/Wiiware/DSiware/steam.
And there is still a cost associated with Digital Distribution that should go in the manufacturing/packaging section, ie cost of servers.
also, Blu ray costs as much as a dvd?