> As executives reflect on LivingSocial’s fatal moment, all point to a security breach in April 2013. Hackers gained access to the account information of 50 million subscribers, and LivingSocial forced all of them to reset their passwords. About 20 percent never came back.

I don't know how they came to this number, but at least it's something to point to when the c-level executives decide password security is something that they can just skip doing. Obviously part of that 20% is are just dead accounts but still, something to show next time you're in this situation.