YQII wrote...
... but it should have very little impact on the experience overall...
I agree with the two versions being confusing (I have two of the same in my favorites that I just noticed, for an older book). I also can see having a book incentive. However, for the past couple books, I did find it useful to be able to see some of the chapters as a preview, to determine if it fit my tastes.
So, as long as those chapters are not removed immediatly (maybe after the book is shipped or made avail for download), I support this plan.