well, but it should be easy to bind the author not to pass it around - and the author is presumably motivated not to do some anyway.

And actually, what I was proposing isn't so much that they should get a nice pretty copy of their book or story, as that they should get a corrected copy - with spelling and punctuation errors and such removed. The text that goes into the final layout. It doesn't seem that there's an extra cost associated with passing that back to the author once it exists, though you're right, there's a little extra risk.