Reading is a solitary activity but when a book has moved or stimulated you it's natural to want to discuss it with someone else. A reading group gives you that opportunity. Also, a group encourages you to think a bit more about the books you read - why you like some, hate others. Unless you're a critic, when you read a book you don't analyse it much. Critics read books in an entirely different way. A reading group is a halfway house between the two approaches, designed to enhance your reading pleasure.
NO SPOILERS - Wait until eveyone has read the book before discussing events. Until then limit posts to processes we can implement that will improve the Club.