My point is that in many cases, you don't need to sign to use your credit card. Order anything online, for example. The only cases I can think of that someone is going to verify something using your signature are going to be cases where the seal of a Notary Public is going to be required, too.

What I'm saying is that there's very little chance that your signature can be used to pretend that someone else is you, so why worry about it? It's much more likely that someone will steal your credit card number, don't you think?