This is a startup/business/tech forum, I am a founder of a 20 person business (hiring 7 more) that does this part-time because it's very low maintenance. I am finally hiring a devops person to handle the command line side of things, though I am still pretty happy to dink around at the datacenter every once in a while.
I taught myself as I went. I save about 10x over AWS. I would likely make the same decision today if I was starting from scratch, as I did 12+ years ago when I first started doing infra for our small website.
Infra is not magical, it's probably the easiest part of my job. Way easier than messing around with JS dependencies, way easier than troubleshooting a segfault in a C extension for our Rails app, and way easier than marketing, business management, accounting, interacting with legal, etc. And takes less time too.