Here's my other justification. I only have to put $20 down. I get to be in the "open beta" and see how the game is. If it sucks, I can get back the pre-order money. If it's awesome, but I change my mind, I can still just buy the base game. Really the only thing I can;t do is buy the middle of the road (digital only) copy, if I wanted my $20 to count for something. Even then, I may be able to get my $20 in the form of store credit if I wanted to go that route and just re-order online.
"A dog is the only thing on earth that loves you more than you love yourself" - Josh Billings