Authenticator owners received a nice surprise in their mailboxes when Patch 3.3 dropped: the corehound pup pet. It's absolutely adorable and a completely unexpected bonus to having a secure account. But it has also caused much kvetching among those who feel they are too careful to ever need the authenticator. Pet envy caused some to sign up for the free application for their phone or buy the physical gadget in order to obtain the two-headed cutie. But they soon discovered that removing the authenticator from their accounts also removed the pet.
Their loss can be your gain, however. One problem that many guilds have is that some of their high ranking members, with full bank access, have account security issues. When a guildbank gets raided by a hacker, it affects the entire guild -- not just the compromised account. One thing guild leaders can do to protect all members is require authenticators for bank access. Previous to patch 3.3, this was hard to prove. Now GLs can just ask to see your corehound pup.