There is no "good" reason to set up more than one.. you will still have to enter the authenticator ID individually. Putting them all on one account is best. If you have more than eight, make another one for that reason only. It is much easier for You to manage the accounts when they are all on the same bnet account.
For example, once they are linked, when you go to account management at the Bliz site, there is now a drop down list with all your accounts. So doing things like transfers and such are way less hassle than before.
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