This has existed for a little while on some sites, but at the end of the day, there hasn't been enough people who want it. People have shown over and over again that they will either click away at the mention of a payment (even as low as 0.25). Also, if a publication puts up an ad to watch against an option to pay $0.25 they will watch an ad. I've seen the numbers bear this out at my workplace (micropayments for publishing)

Personally, I've even run across an article that I have paid access to, but not in the right app (so for example I've run across an article on the web that I have access to in Apple News), and I still couldn't be bothered to find it in Apple News 90% of the time.

So while I think the idea of it sounds good, I don't think it's what the market tells us - at least at this point.