I wrote this article twice. The first version was finished, proofread, and queued to publish. Then someone asked a question about one number in it, and the thesis came apart. I am publishing the second version, along with the part where I was wrong, because the mistake turned out to be more useful than the article I meant to write. What I set out to do Pay-per-event pricing asks you to name a price per unit of value. I had priced eleven Actors that way without knowing what a u...