I "pirate" one piece manga and have been "pirating" one piece manga since 2004. however, i buy one piece manga in the states as well.
I "pirated" beck manga, prior to being licensed some of which I have domestically. they STILL haven't caught up to the point I was at when it was licensed.
I "pirated" deathnote manga, prior to being licensed, some of which I have domestically
I "pirated" 20th century boys, prior to being licensed, but the manga creator is a git who refuses to let them release 20th Cent in the States until they're done releasing his amazing manga Monster
I "pirated" Monster manga, prior to being licensed, and own most of it domestically.
So on. However, with manga I tend to pick up random stuff off the shelf that looks intersting, unlike anime since it tends to be much cheaper. Through this I have been introduced to Tezuka Otomo's Buddha, Yoshihiro Tatsumi's The Push Man and Other Stories, and Abandon the Old in Tokyo.
Suck my nuts. I support the manga industry proudly.