This is the opposite of my previous question.
Is there a way in World of Warcraft Cataclysm to raise your Bloodsail Buccaneers reputation without harming your Steamwheedle Cartel reputation?
This used to work some time ago but with all the changes in Cataclysm I don't know if it still does:
I'd be surprised if this still works. Apart from that I'm not aware of any other way.