[saurik]

Yeah: I do it when the max operations or bandwidth per disk is less than what I "should get" for the size and cost allocated. I had last done this long enough ago that they simply had much smaller maxes, but I recently am doing it again as I have something like 40TB of data and I split it up among (I think) 14 drives that can then be one of the cheapest EBS variants designed more for cold storage (as the overall utilization isn't anywhere near as high as would be implied by its size: it is just a lot of mostly dead data, some of which people care much more about).