[almog]

While not being a bad idea, I think that any advantage of this method and double/triple locking your password manager (by an additional encryption layer) falls into the category of warm-fuzzy-feeling-of-security.

Also, while unlikely to pose a real threat, since this method literally breaks the 3rd rule introduced in the article ("Have a significantly different password for each account") and not only that, it does so by _appending_ a constant string to all your passwords, it introduces the potential risk in case a vulnerability is found in the cipher that's used to encrypt your passwords database.