A whole village in Leicester was slowly being cloned a few years back! and took a while for the Police to work out how it was being done, turned out the local petrol station was cloning cards, and had the CCTV camera pointing at the C/P machine!!! They got caught because the people running the scam didn't know who lived in the village, and who was just passing by... obviously people in the village started to talk to each other, and realised it was either the petrol station, or the local Co-op
They only took small amounts so no one would notice, and they made a small fortune!
Most people wouldn't notice a few quid missing from their accounts, but multiply this by a few thousand people... nice little earner
Thom