Buying used global editions from the international students is the move for undergrads at big schools. Hardcover binding and color print were not missed and definitely not worth 10-20x more. Even published lecturers would ask students to fetch a "course pack" compilation of sloppy photocopied excerpts for purchase by on-campus print operations. Somehow this wasn't piracy. It is no secret that publishers and booksellers have an incestuous relationship with education institutions and aggressively extract pounds of loan debt flesh from the student body.