i did never see a forza advert in germany and gran turismo gets advertisement in any racing sport like formula 1, le mans, dtm , wrc... on the drivers overalls and on the cars and blabla so i really don't wonder gt sales are so much better. they invest like 100 million only in advertisement (no clue about the real costs but they even make advertisement for gt 3 years after the release and before next release) and yeah that'S the reason gt sales are always high. wouldn't make sense to make advertisement and don't sell a a game anymore...
what i wish to say is: if gt sales would be only 5k per week this would be a huge fail with this amount of advertisement even nowadays and thinking about the costs for advertisement i really don't know how much money will be after all of that, maybe turn 10 makes more money after costs than polyphony does (ok i don't believe that but the difference won't be as much as many think)







