This napkin math is pointless, if you're a business leader, you're going to factor in non physical costs as well, since you need a team to run hundreds of servers most likely. If business all of a sudden starts to go under, you can pull plug on cloud, but you'd have to write it off if self hosting.
Hosting yourself makes sense if you're providing hardware level services like storage or compute. In that case, going to the cloud is literally financing your (potential ) competitor.
Hosting yourself makes sense if you're providing hardware level services like storage or compute. In that case, going to the cloud is literally financing your (potential ) competitor.