Pre-ordering games is serious business. For sometimes more than twice the price of the original game (In Australia at least) you can get assortment of special, limited edition memorabilia and maybe some in game content. As someone who will save up to buy these collectors editions of games I've barely seen, I can tell you right now it's not always a perfect end result (I'm looking at you Assassin's Creed 3). There are so many factors to think about when it comes to pre-ordering.
Sometimes a special edition may only be an extra $40, but I have seen some pretty pricey collectors editions. Some games even come with different levels of bonuses, for different prices. When it comes down to it, it's the game which will ultimately persuade you to pre-order or not.
Good pre-order, full of stuff, nice looking statue.
For me, the best pre-orders are the ones where you get the bang for your buck. Large detailed statues, in-depth art books, the soundtrack of the game, additional content and a cool box it comes in. If a pre-order offers me all that it's a done deal. But more often than not, you'll see maybe only a statue or a coin. It's really personal preference, but there are plenty of people willing to pay $150 for a nice statue. Honestly more pre-orders should offer a copy of the soundtrack, it's not difficult and takes up limited space. I'm sure the game's composer would appreciate more people hearing his work too. Right now
WHAT ABOUT YOU?-
You need to decide whether or not you're over-hyped. For me, I pre-ordered Assassin's Creed 3 because I was super hyped for the game, I got the game and enjoyed it but don't think I would have paid as much for it as I did. Especially since i didn't get much in the way of bonuses. You need to think rationally. Look at the bonuses and decide whether you really want to pay nearly double for the game for the bonuses.
Cool statue but is it worth it overall?
In my opinion, most of the time it's not worth pre-ordering. You can pick up the game on the day it comes out, if you wan't to get it. If you the pre-order is too good to be true: Well priced, Full of neat stuff and you know enough about the game to know you'll like it, then go for it. If you feel at all hesitant, that feeling won't go away. Buyers regret is a pain in the ass.
Also I'm real sorry if none of this applies to anyone, I'm Australian and our video games are really weird . . .