There's lots of stuff that was put up on PSN then forgotten about.
Sony could really stand to hound publishers to do stuff with their back catelog or work into the contracts something like "after a game is X years of age or older, we can discount it however we like" so they can do almost store wide sales like Steam.
Sony could really stand to hound publishers to do stuff with their back catelog or work into the contracts something like "after a game is X years of age or older, we can discount it however we like" so they can do almost store wide sales like Steam.