[Lagarto]

The higher the price, the fewer customers. It's OK if you sell luxury sports cars but books are not in that department. If the the sales of volume 1 are not satisfying, maybe it means that the price is too steep, and not because there is not enough interest in the book? Or maybe self-publishing is not that good idea after all.
I had the same problem with JG 4's book. When the first volume came out, I paid $80 for it (+ shipping), but with the second volume I gave up. It's just too expensive for me, sorry.

By the way, I'm sure Brian Cull did all the researches, correspondences and interviews just as well when working on "Fighters over the Aegean", and still his book (a 224-page hardcover) can be pre-ordered at $17.69.