Last year I linked to this fantastic article by Clay Shirky on the reasons micropayments never took off. Shirky wrote:

A transaction can’t be worth so much as to require a decision but worth so little that that decision is automatic. There is a certain amount of anxiety involved in any decision to buy, no matter how small, and it derives not from the interface used or the time required, but from the very act of deciding.

Micropayments, like all payments, require a comparison: “Is this much of X worth that much of Y?” There is a minimum mental transaction cost created by this fact that cannot be optimized away, because the only transaction a user will be willing to approve with no thought will be one that costs them nothing, which is no transaction at all.

Thus the anxiety of buying is a permanent feature of micropayment systems, since economic decisions are made on the margin – not, “Is a drink worth a dollar?” but, “Is the next drink worth the next dollar?” Anything that requires the user to approve a transaction creates this anxiety, no matter what the mechanism for deciding or paying is.

Shirky’s argument looks as solid today as it did six years ago. He pointed to three payment methods as alternatives: aggregation (bundle the business section with the sports section), subscription (take the paper every day), and subsidy (have advertisers pay for the paper). These have all clearly taken off–subsidy especially. Shirky followed that essay up with another in 2003:

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