bananaking21 on 17 December 2015
it will cost them as much as it needs for them to make the game they want. after all, GTA6 will make it back in its first week, or even its first day. thats not taking into account the money they get from GTA online.
i think the development and marketing cost will be up, but not by much. unless GTA6 simply trumps GTA5 in scale and content.
