The mass-market paperback, for one, is too expensive.
Now I have to motivate myself much more than I had previously.
If you can find collaborators whose strengths compliment your own, the result can be more than the sum of its authors.
I'm in favor of any technology that makes my work available to the reading public at a reasonable price.
How long it takes to write a book depends on its length.
I can't speak for the other authors, but what I hoped to achieve was to illuminate certain corners of the Lucas universe that hadn't yet been explored.