They are UNIX systems, they don't need an entire team to be managed once installed and running.
I'm only half joking. It's not UNIX but I've been working with "legacy" systems like IBM i mainframes, and those things don't need much to run. Sure, you have to update the system and the software once every few months, manage backups, role switches, etc., but it can mostly be done by a few people. But yeah, systems like this were (are) insanely expensive so most of his budget probably went there.