I would not care for roster size if I could purchase all DLC (including patches adn bug fixes) and burn it to my own disc and use it anytime I want to with the games I bought. If only PS3 was a more open system.
I'm not a big fan of region locked DLC, limited download times only DRM content etc. That's why I feel more on-disc content gives me more freedom to play the game years from now without relying on Sony or which country I live in. I payed for a game with my hard earned money and just because I move countries I should not be prevented from enjoying the game.