I'll give you one case when this is useful. Let's say that you have to select 20 titles out of hundreds of books. [1] If your browser allows it, it would be convenient to open N amazon links (for N in (100,999]), and then eliminate books as you go through them by closing tabs. In the end you may remain with 20 books or so you shortlisted.

1. I have a similar usecase for http://anynewbooks.com, even though the process is quite different thanks to a ranking algorithm that preliminarily sort the books in a sensible way.