Not to side track the thread to much. Double Arts was in Jump but was dropped. The point being being in Jump dosn't always mean your a hit. They drop plenty of manga all the time due to their exacting standards.
On One Piece though, it's easily my favorite manga. Great mythos, great...everything. I mean...really...the whole world is just amazing.
Ah, the old "are they popular because they're in JUMP or are they in JUMP because they're popular"?