Trybeforeyoubuy - qualities like the shutter lag, LCD screen quality, general handling and button placement etc can only be determined by trying the camera out in a shop.
Giving players the ability to trybeforeyoubuy is always a good thing, but in this case especially, because the game has such an unusual flavor, it could provide vital information.
Finally, it helps that books are quasi commodities -- there's no need to try them on beforeyoubuy -- and that they're small-ticket, impulse items that are easy to ship.