MapleStory : Path of the Hunter...?

I REALLY want to mess with this more. This is just a theory, but I think selecting different completed (key word) card sets grants you higher stats on your monster book equip item (which you can't unequip, by the way. It's like a permanent addition to your stats). I didn't get to try that out when the game was up, but I think I only have one completed set anyway, so I think I need to go monster book hunting before I can really test that theory.