Wow. It turns out that NYC taxi drivers are earning an extra $144 million a year or a 22% increase in tips to due electronic payments. In the past people generally tipped 10% or a few bucks. Now they are using a touchpad system for payment with a 30% tip button, a 25% tip button, a 20% tip button, and a keypad for entering in your own tip. Most people use the tip buttons and this has greatly increased the revenue as people don't want to be bothered entering their own tip amount.

I'm sure that this is something that could be incorporated into other forms of online business aside from tips.

Read more: How electronic payment services are earning cabbies an extra $144 million in tips every year | Technology News Blog - Yahoo! News