Where are you finding capable DevOps engineers for 100k total comp? It’s hard to find someone with the skills to rebuild a SaaS production stack who’s willing to work for that little around here!
I'm picking a random salary that's not too high that lower comp countries/industries will reject, and not too low that higher comp countries / industries will reject, and then doing math on those.
You can then take my numbers or math and plug in YOUR comp rates. But the TL;DR I've seen is many people never even do napkin math like this on ROI.