"Making GTA V cost $265 million" <-- Your point probably still stands but this number isn't completely true. The total was $265 million but 'only' $137 million was development cost. The rest ($128m) was marketing. https://en.wikipedia.org/wiki/List_of_most_expensive_video_g...
It blows my mind that approximately half the total costs of a game are marketing, especially for a series as big as GTA which presumably markets itself pretty well.