Whatever the solution is they'd better get to it because I'm not going to subscribe to every site that wants 20/month just because it shows once on HN or in search results.
That for some reason makes me think of those sites where you can insta subscribe online but you need to call and wait on hold for 6 hours to cancel :)
You know what's missing from this model? Back a million years ago when we all had pet dinosaurs, you could pay for a magazine issue on the street if it seemed interesting. And maybe if you found enough issues interesting you subscribed.
Where's that issue you can try out now?