Yeah. Not sure I have to give folks a view of 50% of the book (I'll try dialing it back a bit), but the point for me is to provide the value of page flipping in a bookstore.
A full chapter would probably be sufficient to give the potential reader a good idea of just how the game's designers develop a concept, which is frakkin' important for the gamer.
But when it comes down to it, as long as it's not the whole book, anyone who likes what they see would be compelled to GET the whole book. So, in that light, 50% likely isn't REALLY too much, either.