Huh? I use them and sign regularly. I meant that once ever, a cashier actively refused my transaction because she found the signature unconvincing. That's why

Huh? I use them and sign regularly. I meant that once ever, a cashier actively refused my transaction because she found the signature unconvincing. That's why I was so baffled by the context - a $2000 computer purchase doesn't get checked, but $6 of cookies got me the wringer.