The email account is on Hotmail and currently has about 54k messages in its in-box, 99.9% unread. I use it to create accounts on news sites and annoying fora and such, always with the same weak password. About the only time I log into is to respond to password confirmation requests generated during account creations.
Originally, the weak password was also my email password. However, a few years ago, the email account got hacked severely, such that MSFT wouldn't let me in until I reset the password. It now has a strong password.
But the point I'm trying to get across is, if I were unlucky that could have turned into a HUGE mess where I was accused of stealing said credit card. Luckily that did not occur (probably because they could trace it to a separate IP address.. and I don't own an Xbox). I no longer use passwords as insecure as I did for that account - I had to deal with this headache while at my family's Christmas party as well (because that is when I received the email), which made it even more irritating.