Generally you get a "dedicated host" from AWS, not a "dedicated server" so that was kind of my first tip off. There's a very big difference; the only usecase I'd really consider for dedicated hosts is security related and, frankly, they're far more expensive than any colo box. Dedicated Hosts are also far more restrictive than what you get at a colo DC. Second, even if AWS offered to let you have full control of a rack box you'd have to be economically out of your mind with AWS' network costs compared to a colo DC.