I pre order for the following reasons:
Special offer/extras exclusive to pre order.
I get home and the game us waiting for me. No having to go out if my way on the way home from work to go and find somewhere that the price is good, the game is still in stock and the eyes aren't too long.
When it comes to big titles like gears if war and gta the supermarkets tend to have a little price war but normally you can find an online retailer that will despatch for day of release (sometimes the day day before) for maybe only a couple of quid more. Takes all the hassle out of it. Some will price match too and you pay when it is despatched, not when you reserve the order.
I do only tend to pre order the big titles though.
Whassamattayou, whyoulookasosad, itsanicaplace, itsanotsobad, heyshaddupayourface.