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Are PINs always needed for paying with card?
Chip and Pin cards are popular in Europe, however in the US we don't have them.  Visa/MC and Amex can issue chip and pin cards but no merchants or machines are set up here to take them.  Only certain countries in Europe use them and since you could possibly have a US visitor or a non-chip and pin person using your machine or eating at your restaurant they usually allow you to sign or just omit the pin if the card doesn't have a chip. It is definitely less secure, but the entire credit card industry in the US is running right now without it, so I don't think the major credit card companies care too much (they just pass the fraud on to the merchants anyway).