I wouldn't be surprised if a lot of them were. After the whole Wii thing, I can see tons of people wanting a quick buck.
My local GameStop is approaching 100 pre-orders (they couldn't fill their Wii preorders day of release), my Best Buy online is not taking any more pre-orders and I just reserved my system at Toys R Us where people started showing up at 3am. They can't all be flippers can they? Should be interesting come November!
Hopefully online retailers doesn't shaft people by saying oh we ran out of stock on launch day, you need to wait. My preorder is locked in on Gamestop.com but only an Amazon preorder would give me certainty that I get it as close to launch as possible from an online retailer.