Of course, it'd be a lot easier to use a fake fingerprint at an ATM in the middle of the night, than to try to pass it off at Trader Joe's in front of everyone and then get stuck paying for groceries if it didn't work.
Heck, it'd also be easier to use a real stolen finger, for that matter

. If ATMs took thumbprints instead of PINs, thieves in parts of the world would have a lot more incentive to take thumbs and maybe lives. (Chopped off fingers are good for up to an hour, and much longer if you use a syringe to inject moisture back into them.)