As someone who works in retail and has to deal with credit cards (and credit card processing companies) fairly frequently, loreleif is 100% correct. You have to sign your card or else it is not technically valid, and while some retailers may look the other way, some will not accept the card (and aren't supposed to, either.)
It is really up to the retailer to request photo identification to verify the proper use of a card...if I accept a charge, for instance, and it turns out to be invalid because it was a stolen card or something, I can be fucked over with some nasty penalties for that and repeated problems can increase my transaction rates and/or end my ability to process cards through a certain bank.
no subject
It is really up to the retailer to request photo identification to verify the proper use of a card...if I accept a charge, for instance, and it turns out to be invalid because it was a stolen card or something, I can be fucked over with some nasty penalties for that and repeated problems can increase my transaction rates and/or end my ability to process cards through a certain bank.