Haven't seen any other posts about this for the Icecrown realm so ima try pasting here.
It seems to me that the rep you get from farming the pirates in Lost Riggers Cove in Tanaris does not give the correct amount of rep. it gives 15rep with gadgetzan and 6rep with the other 3 Steamwheedle cartel factions. as the server is x7 does this not seems off.
I might be off, thought i would make apost and see if someone wanted to give me some answers.