With most of dedicated server providers now, you can get any server with a 1 month contract, no strings attached, for a fraction of the price of an equivalent ec2 instance, and good IO as a bonus. And good providers usually delivers within 24h.

I love aws services and use them myself, but for ec2, but I doubt most users have such volatile needs. The main advantage I see, for aws users (non ec2) is to have everything in the same place.