[I received a question about this video, or about its unusual popularity, or about the unusual quantity of fan mail I receive about it. What is it, exactly, that people like so much about the video?]
People like the idea that they can change.
Because they can't.
They like the idea that they can learn something from reading a book.
Because they can't.
People like the idea that they'll be a better person next year than they are this year.
Because they won't be.
That's the honest answer to your question: people like the video because it makes them feel good about themselves. When they should really feel terrible about themselves.