I don't think postpaying is a necessary model, there could be a popup saying you don't have a subscription and to read the (full, probably) article is $0.05, wo

I don't think postpaying is a necessary model, there could be a popup saying you don't have a subscription and to read the (full, probably) article is $0.05, would you like to pay this? I would almost certainly click "yes" on a lot of the stuff I don't wind up getting much value out of, and hey, 5c is naturally not that much so it balances out! And maybe that Isaac Chotiner or Bill Simmons (stay with me) 8,000 word'er will be $1. Package deals are easy. In fact, what with d-u-m-b cookie settings, email begs, and rest of the stack of "first 5 seconds" mandatory interactions, right now would be a great time to pop up a less-annoying payment dialog: "[Yes] [Account] [Sign Up] [No]"