The beauty of credit cards is that you're not responsible for fraud. I know that when I go to a restaurant the server could easily take a quick cell camera shot of my card, but I accept that risk because I know that I monitor my card activity and that I can recover that money if it does happen. The same applies here.

All you need is a taxi, and iPhone, and you can go around town collecting credit card numbers.

And unlike websites, there is no paper trail to link you to the scam.