Well I think it was a combination of both. It was probably easier to ignore GA, but at the same time for the basic story you don't need to have played GA. I mean the original God of War collection omitted the PSP games, and while they did explain the story of Kratos a bit better, they were by no means required to get an understanding of the basic plot. Also there may have been some conversion issues because it was developed by a company other than Naughty Dog. Granted, the collection was handled by BluePoint, but I'm sure ND was heavily involved with this game and having to go through the other company as well may have led to more trouble than it was worth. I'm just looking forward to going through and finally beating 1 and then hopefully beating 3, which drove me to rage quit.Golden Abyss was a prequel to the Uncharted 1-2-3 trilogy and includes important aspects of the development of his relationship with Sully. It was purely a $$ reason not to include it, not a "holistic" one. ( A lot more work would have been involve to port it.) Ironically, including Golden Abyss could have really driven sales from people who never got a chance to play GA on the Vita. I wouldn't be surprised if GA is released as a separate downloadable game in the next 12 months.