I've actually given "this model" a LOT of thought. By "this model" I mean free public content that has deeper content in other forms available by subscription. It's quite doable, and there are plenty of platforms that can take care of most of the logistics for you (video, streaming, downloadable content, etc.). The reason I haven't done it is (mostly) simple: once you turn on a media outlet (subscription or free), it is a black hole for content. You must keep feeding the hole, and the higher the quality you do so with, the more likely you retain the subscribers and free viewers. But that also introduces another problem: what's the right cutoff point between the subscriber-only content and the free content? A place like dpreview had a natural cleavage point that they never exploited (again, Phil and I had arguments about this). Had "dpreview free" been news, forums, and downsized reviews, and "dpreview subscriber" been tutorials and deep reviews, it might still be in business. Might. Subscriber retention is always tough.