This project is to help others spread joy and kindness, instead of having to spend so much money on others. Mind you it is nice to get presents, but sometimes people often feel the need that they have to go hundreds of dollars in debt just to show someone you love them.
If you read this really cool book, and you want others to read it, leave it behind at a cafe, or on a bus. Leave a note explaining that you are leaving this book for someone else. This also works for self help books.