The Problem With Many Non-Fiction Books

They don't really need to be full books. This sounds good, for instance: Better by Mistake: The Unexpected Benefits of Being Wrong.

Good topic, right? But I look at the book: $18 and 300 pages. Really? It strikes me as more of a long-article topic. It gets me thinking...amazon has started selling these long articles and short stories for $2-$4. I actually think this is a nice little sweet spot for writers and journalism and non-fiction (I doubt I'd buy a short story unless it was amazing, like Brokeback). I can imagine this topic being a nice 30 page article and I'd pay $2 for it. But a hardcover book? No thanks...