Not to mention some people travel cross country to visit relatives and still want to play WoW while they're there.

I've been playing MMOs since the day ultima online came out and have never been hacked. HOWEVER, I still spent $6.50 for a WoW authenticator "just in case". I mean come on, most of us here pay $45-$75 a month to play WoW, a one time fee of $6.50 to guarantee you'll never be hacked is a no brainer, especially since you can use that 1 device for all 5 of your accounts at the same time.