What Is A Successful Published Book?

I don't believe that you can say that the only successful book is one which has sold 1,000 copies, or even 100 copies. I think that you need to define in your own mind what is a successful book. I've been debating for a while, what I can call a success.

I'd love to sell a million books, and I would love to do that for a long time, but I suspect I am also a realist-- or not too terribly