I have accounts set up like so:

A -> B -> C -> D -> E

I have boosted on my Mage on account A, but I am getting a little worried that my Account A is only going to have as many level 60s as I create on account E. Since I regard account A as my main account (its where I do most my auctioneering) I was considering boosting up on one of the charactes that I ahve made.

So I could use account B as the booster account. Would this be a good idea? And the question that links it to this topic... I only have a level 73 Shaman team.