[jauntywundrkind]

You're also getting pretty stale instances by the end of the 3 years.

At two difference companies, I've seen a big batch of committed instances finally go off contract, and we replaced them with more modern instances that improved performance significantly while not costing us anything more or even letting us shrink the pool, saving us money.

It's a pain, but auto scaling groups with a couple different spot instance types in it seems to be quasi necessary for getting an ok aws compute value.

[mgaunard]

You'd have the same problem if you bought your own hardware. You don't throw it away and replace it until it's been amortized.