Publishing this type of book is not only an excellent way to save the costs of royalties, because anyone can publish them, the market cannot be "monopolized," so the profit margin will be limited.
如「簡愛」、「戰爭與和平」… … 等。出版這類書籍，不失為節省成本的好方法；但因人人可出版，市場不能「壟斷」，獲利也有限。