Micropayments for web/editorial content is a much harder problem. There's no central egress point for this content, it's spread over all the sites and a tracking system needs to be in place (but people hate that) as well as massive scale to touch all those sites and check the usage.
This is something that would need massive cooperation and integration between websites, ad networks and even ISPs to get right. If it was that easy, the industry would've already done it. The fact that Google is on it's second approach with their Contributor program and still not finding any luck is telling. (And Google owns a ridiculous amount of the layers in the modern web so they're probably in the best place to pull this off).
