On-Disc DLC? Apparently you haven't ever "Glitched" in to areas like The Seraphim Vault (if you did before the DLC, you would've realized all of the textures were placeholder textures and were barely finished). The only reason those areas are on the disc is to serve as a "Skeleton" for the environments the DLC will be on, so that we don't have to download MASSIVE updates. GTA V's DLC was free because the DLC added barely anything (same thing for the new Witcher, yeah it's free but it adds only cosmetic things).