I think I didn't elaborate my point enough, so there's a misunderstanding.

What I said is true for places where they already have sysadmins for various tasks. For the job I do (it's easy to find), you have to employ system administrations to begin with.

So, at least for my job, working the way I described in my original comment is the modus operandi for the job itself.

If the company you're working in doesn't prefer self-hosting things, and doesn't need system administrators for anything, you might be true, but having a couple of capable sysadmins on board both enables self-hosting and allows this initiative to grow without much extra cost, because it gets cheaper as the sysadmins learn and understand what they're doing, so they can handle more things with the same/less effort.

See, system administrators are lazy people. They'd rather solve problems for once and for all and play PacMan in their spare time.