The costs of the VMs scale linearly. The bigger they get, the more additional capacity we need to be able to launch on demand ones. It's not just RAM, though,

The costs of the VMs scale linearly. The bigger they get, the more additional capacity we need to be able to launch on demand ones. It's not just RAM, though, our physical servers have a consistent ratio of RAM/CPU/disk available. You're basically just buying slivers of hardware we've already paid for. That said, our pricing isn't far off of AWS. They have much better economies of scale than we do, and can afford to do Graviton, but you get pretty close horsepower per dollar for comparable instances.