Why does PS3 games have DLC if its on a Blue ray?

[phinch1]

did little big planet take up 40gb? and that has lots and lots of down loadable content and it doesn't look like its slowing down i mean like judge dredd sack boy! how ace, i think when little big planet has finished with its dlc? even if theyd have tried they could not fit it all onto the disc with the game