My environment is relatively static. Is ProsperOps still useful?

Yes. The more static an environment, the less complex RI management can be, but it still requires time and effort. An RI purchase mistake or missed RI expiration can be costly and materially exceed the cost of ProsperOps. Also, in our experience, static environments in the cloud tend to become more dynamic over time, so enabling ProsperOps now ensures that your RI portfolio remains optimized as you grow.