I'd read up on how the protocol works... There could be a live "relay" attack available , but it's not like someone could just swipe your butt and make a bunch of cloned cards. The magstripe is more of a hazard than anything else as it the numbers on the front un-encrpyted.
I'm aware in considerable detail how EMV works, both for wired and wireless transactions. This was a choice made in light of my understanding of how flawed the technology is.
See Ross Anderson's extensive material (sorry there's a lot of other stuff in here too) at Light Blue Touchpaper (a reference to Cambridge University's traditional colour and the instructions on fireworks):
