Thanks for the reply.

I have a list of the "important" mounts and which accounts have them, so I could choose the merges that way. Even if I miss, I'd only have to get one more drop. (The list is short, Headless Horseman and Ashes of Alar)

A buddy was running merged accounts, and way back he had to get several authenticator codes written down over a few minutes, before using them all at once to log in. Has that behavior changed? Or is it that they now buffer how often you enter the codes, so this mini-"hassle" is only once per week?

Support said there was still an 8 account per BNet limit, so if I merge, and 10-box, I'd rather it end up as 2 groups of 5 that have good mount/pet/toy coverage.