As long as online stores don't sell pirated books, buying them in online stores can really save a lot. However, because the price of online stores is too low, bookstores also complain. Many bookstores said that Dangdang and other online stores disrupted the market, making it difficult for bookstores to survive.
If the online shop sells pirated books, of course, it is bought from pirates. Because piracy does not have to pay the author's manuscript fee, proofreading fee, typesetting design fee and binding design fee, it is printed with very cheap paper and ink, and even does not have to pay expensive office rent, so the cost is very low.