I can't recall the price. I don't think it was the one on the back cover. (Ian might be able to recall.)
As to why I paid whatever it was.... First, I'd already read something Ian wrote about flying boats (there's a link to it from
here) and I liked the imaginative way he built the story. Second, if you'd seen what I was paying for meals and accommodation at the Eastercon, you'd realise that the book seemed pretty reasonably priced. Third, in buying a book there's always a risk that it's awful. Two dollars for 1000 pages of boring drivel would be two dollars too much, whereas I bought a well-written novella/novellete (I haven't counted the words
) and looked forward to reading the next one (which I now have and also liked).
Besides, the length of a work should be that best suited to getting the story across. Just because some authors present us with thousands of pages doesn't necessarily make the book better value. And given that not even a big lottery win would give me a second's more time in my life, sometimes I'd prefer a book to be shorter (as I rarely skip paragraphs or chapters; unless they're meant to be songs).
Finally, a question: would you pay twice the normal price for a recording of Chopin's so-called
Minute Waltz** that lasted two minutes, even if it was played as fast, but with extra repeats - perhaps in different keys - added?
I don't think I would.
** - Waltz in D-flat major, Op. 64, No. 1