Earlier quoted context omitted.
That money bought them things like this: http://static.trustedreviews.com/94/000028992/826f/GTA-5-mur... (That is a massive painting on the side of a building, incase that isn't clear)
I'd like to know what are the ROIs for an advertisement like that. I can't really imagine that the people who will buy the game will buy it due to this advertisement. At the same time though, Rockstar probably knows what they are doing.
"Hype" definitely gets sales. It leads to people checking out the game/movie, paying attention when they otherwise might not have - it's a form of social proof.
$800m in sales, first day. How much of that was due to marketing? Who knows. But it looks pretty positive to me, and stunts like this are part of it. Almost certainly positive, IMO.