Do not bother farming for the Badge. Complete the questline in the BEM to make you the Ogre King. This will open up the daily quests in Ogri'La. There are two benefits to these quests: The first is a steady source of income and the second is a Banish More Demons quest. This quest has a chance of rewarding you with a Darkrune. This Darkrune (converted to crystalforged Darkrune)is used to start the Shartuul Transporter Event. One of the possible rewards for this quest is the Badge. Even if you do not get the Badge the first time, you will eventually either be rewarded with it or will be able to afford it from the AH (800-1400g). The drop rate for farming the badge from regular mobs in Ogri'La is not worth the time.
If you really want to farm. Go farm for motes and you can afford the Badge much faster.
Edited, Dec 19th 2007 3:06pm by UrsaGeneral