Dear seniors, may I ask that the profit from operating books will probably be less?
Not so profiteering! The purchase price in the book wholesale market is about 30% off for best sellers, 6% off for general, 8% off for magazines and 4% off for those that are not easy to sell. And many kinds of books are non-refundable, so the profit is not too high. You should go to the local book wholesale market to find out the market first.