You could start looking around you and ask yourself: What's the point? We now have wireless credit cards (at least in Sweden) that registers your purchase at once, so that you might think it's quick and convenient . But what happens if your credit card gets stolen? There's no password required for you to purchase things, all you need to do is to put it on the machine and you've got yourself a bag of crappy food all of a sudden, and others can do the very same thing with your credit card. People can more easily steal from you which brings a collective scarcity because people comply and do not say "Don't do that, it's bloody stupid to promote"