There are plenty of copies just because as everyone else noted, it was a C list marvel book and those sold better than A list DC books, for the most part. Its circulation was tiny compared to the same month's ASM though. Miller made DD a hot book pretty quickly (I don't think folks really knew who he was before then, but the stories took off, DD went from a kind of lame character who fought lame bad guys to something pretty cool with the ninjas, elektra and kingpin getting scarey)..frankly, i have no idea, the stories got cool, was it because with his art a lot of us thought we had a chance at being comic artists vs. byrne or perez or starlin who reminded us we didn't have a shot? I dunno.