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The rule of growth
(i.imgur.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
I'm not a server admin, but I am a dev, and for many of us it's just what we know because it's what our employers use. So sadly, when it comes to setting up infrastructure on our own time, the path of least resistance is just to use what we're already used to.
Personally I'm off AWS now though, but it definitely took some extra work (which was worth it, to be clear).