I have been a leecher here for some time and think I have (hopefully) thought of an original idea.
What you will be doing is selling access to the quest item needed in Promises, Promises.... You will of course need to be in a guild that is clearing Zul'Aman past Nalorakk. That way the quest item is cleared to walk to from the entrance.
The way I set it up is having one of my accounts in a city acting as a barker, he advertises that he is selling access to the Tattered Hexcloth Bag for 20G (move the price as you see fit). I also remind folks that a similar bag a Primal Mooncloth bag typically sells for upwards of 400G.
As I am contacted I direct people to go to the Ghostlands and accept the quest from Budd Nedreck just outside the entrance. From there they will need to pay my second account who is just outside the zone in of the instance who will actually do the inviting in exchange for the cash. He also removes them as they leave.
There are some problems with it, so make sure your guild is done in there and folks will inevitably form there own raid group and do it, but free cash is free cash.