Agreed. That's what we found at Bitpass, a micropayment system for digital content in which people were asked to buy a prepaid "phone card" for digital content.

Agreed. That's what we found at Bitpass, a micropayment system for digital content in which people were asked to buy a prepaid "phone card" for digital content. The minimum prepay was $3 and people were still complaining. So, based on our experience at Bitpass, we recently launched a cashless micropayment system, ThankThis.com. Instead of a Flattr button, there's a ThankThis button. Clicking it shows you a small sponsored message (i.e. an opt-in ad), which pays the publisher and gives you points for your favorite charity or nonprofit, which could also be wikipedia.