I think the pirated books suit us very much. Because when we study in middle school, we need a lot of reference books, in order to get a good-enough grade to get into a good school. But the reference books become totally useless after the exams. And an original reference book is much more expensive than a pirated one. Furthermore, we usually buy reference books in bulk, so it saves more than half of the amount of money to buy the pirated reference books.