Let's play a cute game of numbers - devil's advocate so to speak.
How many Android "fans" are there.
How many Android "fans" would love to quote this book
How many MS "fans" are there.
How many MS "fans" would love to quote this book.
How many Samsung "fans" are there.
How many Samsung "fans" would love to quote this book.
How many Apple "fans" are there.
How many Apple "fans" would love to shred every "fact" and enrage themselves in reading it just because they can.
Subtract the # of "too cheap to even pay for a .99 app - they'll probably just torrent the book
I think that pretty much sums up the sales volume this book could have