Okaay, this is a theory, You sure all know the html changing scam, where you change the E-mail so it looks like the mail on the account is changed, but it isn't.
This might be an improvement of that scam, instead of him finding out that it isn't changed as soon as he get in to the account, just change it to an E-mail that has same starting letter. He logs in to the managing site, and believes that you have changed it to his E-mail.
Dont know if its possible to make E-mail that doesnt exist, and then after make it yourself, so you still own the account.
Is this usefull? all kinds of feedback will gladly be accepted, even if my english sucks ^^