That's the point. They aren't trying to sell IO with glacier, since they've already saturated that with EBS. They just want to sell the spare storage capacity,

That's the point. They aren't trying to sell IO with glacier, since they've already saturated that with EBS. They just want to sell the spare storage capacity, ideally in a write once read never use case. That way they can achieve 100% utilization out of the drives. So if you use a lot of IO with Glacier, they are going to charge you like crazy, since you're potentially impacting EBS customers.