I voted for one million readers, one copy, but my real answer is none of the above. Any kind of numbers game is a bad idea when it comes to writing - number of downloads, sales, readers, lack of readers, critics response and all the rest detracts from what a writer really has to do; please themselves. There's a quote, and I can't remember who said it or if I'm getting it correct, but it goes soemthing like this:
To write for ones self you may lose the public. To write for the public is to lose ones self.