Why not torrent them instead? I mean it: I assume that collecting bogus data doesn't do them any good and torrenting would save the publisher some server load. A script that buys every book, on the other hand, doesn't even contribute to popularity statistics.
I'm just going to go ahead and get just 1 the legit way. However I wish they made some sort of volume discount that wouldn't mean paying £300+ for a 10-15 book collection.
Honestly most of these books are on topics that would make them obsolete quite soon. The real practical use for these is as references across several topics. I understand it's hard to monetise that kind of thing though.