There's much lower hanging fruit than that. Just think of all the people who are conditioned by Facebook et al into believing that entering your gmail address a

There's much lower hanging fruit than that. Just think of all the people who are conditioned by Facebook et al into believing that entering your gmail address and password to "invite all your friends" was a normal thing to do... Without a doubt many of the same people will happily tack their CC-info into any form within any half-plausible context ("we must verify your age before we can use your gmail password to invite all your friends").