It's a hard problem to solve, because you're selling disk based on capacity. Problem is, capacity is easy to figure out, but capacity at a specific performance profile is hard.
In an enterprise datacenter, a "fast" Tier-1 or Tier-2 SAN runs anywhere from $10-40/GB/Year to the end user. A "cheap" (and much slower) Tier-3 SAN runs anywhere from $1-15/GB, depending on utilization, availability, etc.
I don't think even those rates are possible with Amazon (with the exception of S3 object storage), because they don't know anything about their users. In the enterprise, you segment your users based on anticipated peak performance requirements. Amazon has no idea what your performance profile is -- and no idea whether it will change tomorrow.
In an enterprise datacenter, a "fast" Tier-1 or Tier-2 SAN runs anywhere from $10-40/GB/Year to the end user. A "cheap" (and much slower) Tier-3 SAN runs anywhere from $1-15/GB, depending on utilization, availability, etc.
I don't think even those rates are possible with Amazon (with the exception of S3 object storage), because they don't know anything about their users. In the enterprise, you segment your users based on anticipated peak performance requirements. Amazon has no idea what your performance profile is -- and no idea whether it will change tomorrow.