You see Wormgod, when we ask for copy of CC is the same as making the old fashion zip zap imprint, now with a D/L, it is not that important but necessary if you are sending product to an address not with the billing co. The D/l is used as an address verifier. If someone wants to steal they can, how many times have you given you CC to a waiter in a restaur. ?
On the other hand, if the guys didnt give you good impression to start with, I can understand that !!