This book contains great contributions from smart authors -- they'll inspire you to do better work, become an artist and a leader, and truly make an impact in the world. I loved it, and that's a fact. But to be honest, that's not why you should buy it.
Almost anyone reading this can spare $20. If you can't (and please think seriously about it if you think that's the case), you can afford 20 minutes of emailing and tweeting and blogging about it. Every sale of this book saves lives -- real people's lives -- and that makes it a no brainer. If 100,000 books get sold, 4 million lives get saved. You have no excuse to bow out; your internet connection suggests that your life is full of luxuries that most of us will likely take for granted. $20 is a few cups of coffee. Buy the book. Benefit from the content. And make the difference.