There are a couple of reasons we decided to publish Age of Desire in the format that we did.
1) We thought the project deserved being a hardcover. Tim has waited over a decade to have this book come out and we wanted to present it in the best format we could publish it in.
2) In order to get it into the bookstore marketplace we had to have a decent sized spine, which the hardcover gave us. Printing the book in paperback format would have just made it a comic, which would have no shelf-life and would not be carried by the bookstore marketplace. We picked the size we did after seeing Neil Gaiman's and P. Craig Russell's adaptation of Coraline. It looked great and, in my humble opinion, so does Age of Desire. It's also a format that Dark Horse has used with a number of its hardcovers (with a similar price point) over the last couple of years with great success.
I'm sorry if some aspects of the printing of the book disappointed you, but I hope you are at least happy with the end result of seeing Clive, Tim and Craig's long-awaited story finally in print.