Oh, Marvel. Lashing out at your fans is probably not the best way to proceed. Especially not the ones who go, "I saw this comic on scans_daily and it was awesome, so I'll buy the whole series!"
I dunno. I'm kind of goofy and idealisticish, but I figure maybe starting with a warning instead of insta-litigation or insta-ban would probably be the best way to go. *shrugs*