No, because when a card is stolen, cardholders are still liable for up to of the fraudulent amount charged, although most issuers now offer zero liability for fraud or theft. 2: There's no credit limit on your American Express card, so you can buy anything you want.
At checkout, simply enter your B-Rewards number and access code in the Buckle Gift Card field.
A fake number will work for sites that store credit card information to either charge you later or ask you to upgrade.
For sites that ask for an upfront fee or have an automatic charge sometime down the line (Hulu Plus, Netflix, Spotify), this won't work since they ask for more than just a credit card number for validation.
If you do give a clerk an unsigned card or one with "See ID" written instead, they're supposed to have you sign the back of the card and check the signature against your driver's license or passport.
This may trip up a fraudster a bit -- after all, a thief is unlikely to be able to mimic your signature on command -- but that's only if the cashier bothers to take the time to compare that signature to the one on the driver's license. Does writing "See ID" absolve you if the card is taken and used?