1. He has something to say to everyone, no matter what they think of Jesus.
It's true, whether you are a Christian or not, mature in your faith or just working out who Jesus is, there will be a book that he has written that will help you. Basic Christianity is one that I would recommend for everyone.
2. Writers who speak the truth are sometimes hard to find.
There is a lot of people writing books, but how can you know if they are telling the truth when it comes to God? Stott is honest about what he believes, and how he came to believe it. When he isn't sure about something he says so, and he isn't arrogant about his opinions. He is very straightforward and I find it refreshing.
3. It is nice to read something where the writer cares for his reader.
Enough said. Stott wasn't out to make money he was out to save souls.