I've read this book many times to my kid, and while it was a personal favorite growing up, I can't help but think the message it sends isn't the best. It basically boils down to: if people don't want to be your friend, you should consider changing who you are, and if that doesn't work, try bribing them instead.
E. The Giving Tree is another popular book I am fond of from childhood with a poor message imho. (Take take take no matter the cost to others) but in truth, that book is at least a good metaphor for parenthood as a whole. (We're the tree)