Buyers must buy books from the secure site to prevent themselves from being cheated.
Buyers take risk for credit card fraud
They take risk for not getting books they buy.
Many people prefer the traditional way of buying thing from stores.
They can see a product with their own eyes on wooden bookcases, touch it, and take time to make decision and make sure that it is a good purchase.
They can look around the shelves and buy other books in the same area.