Well, I definitely went back and forth about it, but I finally decided on hardback. Originally I had asked Mike Mearls to write the Aerial book in three parts because I thought the modular format would appeal to people. And it does appeal to some people, including you, evidently! But I got mixed reviews. Some people liked being able to pick and choose, but those who wanted "the whole kit and kaboodle" preferred a single volume because it's cheaper that way. And it IS cheaper to produce something as a single volume than three separate volumes (you need one cover painting rather than three, only one binding, only one print run, etc.). In the end, I got more responses from the "I want it in one volume" camp than from the "I prefer multiple volumes" camp, so I opted for that. Democracy at its best.

And, on a page-per-page basis, it will be cheaper as one volume versus three.
As for the hardback decision, I've also gotten feedback that a lot of people prefer hardbacks. I know that I personally do, but my preferences don't always match everyone else's. But I'll find out soon enough...
