I used to preorder a lot of games "back in the day", but thats when I worked at a game retailer, and got a significant staff discount, and back then I was a sucker for a special edition (read: idiot). Sure, I'll pay an extra ten quid for a big plastic batarang and an art book, why not?
Since the redundancy though, and the game industry as a whole eating itself alive, theres very little thats come out in the past year or two that I've been so invested in that I wanted it day one. If I do preorder a game, I'll do it on Amazon, a few days before release, and then only if its got extra content that I think is worth having. I'll likely preorder Arkham Knight, because Rock Steady have done good extra content in the past, but I'm on the fence about Witcher 3. There's nothing else I'm even vaguely interested in the rest of the year...