Which is because other than the five minute nostalgia burst you get from loading these up there is no way you're ever going to put the time and skills needed into completing most of the other games. Would you really play through a nasty version of the nasty Golden Axe 3? Or go right back to the start of the Phantasy Star series and play through I to IV? Also weird is the way you have to play through the Mega Drive version of Altered Beast to unlock the arcade version, it looks a lot better but you've just completed the game so the impetus has gone. Although we're getting a hankering to put Ecco: The Dolphin on just to have another dolphin to tell us to "Swim slowly passed eight arms".