There's no reason not to have an authenticator. I bet they even throw them in with the new expansion for free in the box. Would be a smart thing for Blizz to do imho.
But for right now they're like 7$ US with free shipping and you get a free pet to boot if you care about that sort of thing. A small fee to protect your 100$'s invested and 100's of hours of time. Might take an extra minute to login but it takes a hell of a lot more time to recover a stolen account.
If you open yourself to a man in the middle attack in the first place. That person is probably not computer savy in the least and would end up hacked no matter what. Despite claims that these man in the middle attacks are going on I have yet to see one post on the Blizz Forums backing this up. Every post on the Blizz/Customer service forums of a person being hacked none had an authenticator.
I mean I've scoured the Blizz forums over with searches and see not one claim of being hacked WITH an authenticator attached.
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