only problem with that is it wont really scale with your # of alts you are leveling

this is more of a power level method if you only need to level 1 character.

Also, in LBRS it requires a pally, mage, and a healer, all 70. a pretty steep requirement. THis also means you only have room to power-level 2 characters.

I can see it being useful if you want to powerlevel a group of 5 characters... you first boost the 4 using a single booster (mage or pally or whatnot), then you use this method to boost the 5th very quickly.