I'm a sucker. I jumped in. All credit cards in one card.

[Chakravartin]

It's also notable that vendors are not supposed to take a card with no signature on the back. The signature is not just for identification purposes. It represents your contrsct with the card company.

http://www.creditcards.com/credit-card-n...D-1282.php

...if they ignore this mandate and accept an unsigned card anyway, they risk financial liability should the cardholder later dispute the charge.