Thought I'd upload this video for anyone else who might be interested in doing this.
Many groups are doing this now, but as multi-boxers we can do it by ourselves, which is a huge advantage. I have most of my 20 level 100s equipped with 655 or 670 capes and belts now which really helps bump up the gear score for anything else you want to do. I've also made a few hundred thousand gold on the AH selling stuff I don't need.
The video shows the most efficient way I found: farming the first three packs of mobs in Heroic Highmaul. As you can see, I kill 21 mobs in about 5 and a half minutes, then reset. I average a BoE about every four resets, so can get them fairly quickly. Of course, you have to have a toon at about 640 ilvl to get into a Heroic Kargath PuG kill first. Then set that toon as leader before you enter Highmaul.
A five boxer could probably do this as well, but it would be much slower.
https://www.youtube.com/watch?v=rOC11NAkBkc
