You made a good point about Kwedit back in the day, which I believe applies just as well here. Namely, micropayments on the nickel-and-dime scale are seriously challenging. How does a vendor price them effectively? How do you get a consumer to wrap his/her head around them?

Everybody understands the value of a dollar; nobody understands the value of a nickel. Coins, pseudocurrencies, and loyalty points seem much better suited to overcoming that psychological barrier.